m
Find the absolute extreme values of the function on the interval. 13) f(x) = 7x8/3, -27 ≤x≤ 8 A) absolute maximum is 1792 at x = 8; absolute minimum is 0 at x = 0 B) absolute maximum is 6561 at x

The absolute extremes of the function f(x) = 2x^3 – 6x^2 – 18x over the interval 1 < x < 4 need to be determined. The absolute maximum occurs at x = ?, and the maximum value is ?.

To find the absolute extremes, we need to evaluate the function at the critical points and endpoints of the interval. First, we find the critical points by taking the derivative of f(x) and setting it equal to zero: f'(x) = 6x^2 - 12x - 18 = 0

We can solve this quadratic equation to find the critical points, which are x = -1 and x = 3. Next, we evaluate the function at the critical points and endpoints:

f(1) = 2(1)^3 - 6(1)^2 - 18(1) = -22

f(3) = 2(3)^3 - 6(3)^2 - 18(3) = -54

f(4) = 2(4)^3 - 6(4)^2 - 18(4) = -64

Comparing the values, we can see that the absolute maximum occurs at x = 1, with a maximum value of -22. Therefore, the absolute maximum of f(x) over the interval 1 < x < 4 is -22.

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The cost function C(x) is 3x + 5250, and the simplified profit function P(x) is -0.4x^2 + 357x - 5250.

Since the first letter of your last name is not provided, let's assume it is "M" for the purpose of this example.

Given that the fixed cost, h, falls in the range of $5,001 to $5,500, let's choose a value of $5,250 for h.

The cost function, C(x), is given as C(x) = 3x + h, where x is the number of app downloads and h is the fixed cost. Substituting the value of h = $5,250, we have:

C(x) = 3x + 5250

The profit function, P(x), can be calculated by subtracting the cost function C(x) from the revenue function R(x). The revenue function is given as R(x) = -0.4x^2 + 360x. Therefore, we have:

P(x) = R(x) - C(x)

= (-0.4x^2 + 360x) - (3x + 5250)

= -0.4x^2 + 360x - 3x - 5250

= -0.4x^2 + 357x - 5250

So, the cost function C(x) is 3x + 5250, and the simplified profit function P(x) is -0.4x^2 + 357x - 5250.

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To find an equation of a line that is tangent to the curve y = S cos(2x) and has the minimum slope, we need to determine the derivative of the curve and find the minimum value of the derivative.

Taking the derivative of y = S cos(2x) with respect to x, we obtain y' = -2S sin(2x).

To find the minimum slope, we set y' = 0 and solve for x. The equation -2S sin(2x) = 0 implies sin(2x) = 0. This occurs when 2x = nπ, where n is an integer. Solving for x, we get x = nπ/2.

Therefore, the critical points where the slope is a minimum are x = nπ/2, where n is an integer.

To find the corresponding values of y, we substitute the critical points into the original equation. For x = nπ/2, we have y = S cos(2x) = S cos(nπ) = (-1)^nS.

Hence, the equation of the line tangent to the curve with the minimum slope is y = (-1)^nS, where n is an integer.

To find the equation of a line tangent to the curve with the minimum slope, we need to find the critical points where the derivative is zero. By taking the derivative of the curve y = S cos(2x), we obtain y' = -2S sin(2x). Setting y' equal to zero, we find the critical points x = nπ/2. Substituting these points back into the original equation, we find that the corresponding y-values are (-1)^nS. Therefore, the equation of the line tangent to the curve with the minimum slope is given by y = (-1)^nS, where n is an integer.

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a) The point O P(1,0) lies on the unit circle.

b) The point ° 0(23, -2) does not lie on the unit circle.

c) The information for point c) is missing.



a) The point O P(1,0) lies on the unit circle because its coordinates satisfy the equation x^2 + y^2 = 1. Plugging in the values, we have 1^2 + 0^2 = 1, which confirms that it lies on the unit circle.

b) The point ° 0(23, -2) does not lie on the unit circle because its coordinates do not satisfy the equation x^2 + y^2 = 1. Substituting the values, we get 23^2 + (-2)^2 = 529 + 4 = 533, which is not equal to 1. Therefore, this point does not lie on the unit circle.

c) Unfortunately, the information for point c) is missing. Without the coordinates or any further details, it is impossible to determine whether point c) lies on the unit circle or not.

In summary, point a) O P(1,0) lies on the unit circle, while point b) ° 0(23, -2) does not lie on the unit circle. The information for point c) is insufficient to determine its position on the unit circle.

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The polar coordinate (9,0°) can be converted to Cartesian coordinates as (9,0) using the formulas x = r cos θ and y = r sin θ.

To convert the given polar coordinate (9,0°) to Cartesian coordinates, we need to use the following formulas:

x = r cos θ y = r sin θ

Where, r is the radius and θ is the angle in degrees. In this case, r = 9 and θ = 0°. Therefore, using the formulas above, we get:

x = 9 cos 0°y = 9 sin 0°

Now, the cosine of 0° is 1 and the sine of 0° is 0. Substituting these values, we get:

x = 9 × 1 = 9y = 9 × 0 = 0

Therefore, the Cartesian coordinates of the given polar coordinate (9,0°) are (9,0).

We can also represent the point (9,0) graphically as shown below:

In summary, the polar coordinate (9,0°) can be converted to Cartesian coordinates as (9,0) using the formulas x = r cos θ and y = r sin θ.

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Normal vector is perpendicular to the line given by the parametric equations x = 2 - t, y = 3 + 2t, z = 4t.

To find an equation of the plane, we first need to determine the normal vector. Since the plane is perpendicular to the line, the direction vector of the line will be parallel to the normal vector of the plane.

The direction vector of the line is given by <dx/dt, dy/dt, dz/dt> = <-1, 2, 4>.

To find a normal vector, we can take the cross product of two vectors in the plane. We can choose two vectors by considering two pairs of points on the plane.

Let's consider the vectors formed by the points (-5, 2, 2) and (0, 6, 0), and the points (-5, 2, 2) and (0, 7, 2).

Vector 1 = <0 - (-5), 6 - 2, 0 - 2> = <5, 4, -2>

Vector 2 = <0 - (-5), 7 - 2, 2 - 2> = <5, 5, 0>

Taking the cross product of Vector 1 and Vector 2, we have:

<5, 4, -2> x <5, 5, 0> = <-10, 10, 5>

This resulting vector, <-10, 10, 5>, is perpendicular to the plane.

Now we can use the normal vector and one of the given points, such as (-5, 2, 2), to write the equation of the plane in the form ax + by + cz = d.

Plugging in the values, we have:

-10(x - (-5)) + 10(y - 2) + 5(z - 2) = 0

Simplifying, we get:

-10x + 50 + 10y - 20 + 5z - 10 = 0

Combining like terms, we have:

-10x + 10y + 5z + 20 = 0

Dividing both sides by 5, we obtain the equation of the plane:

-2x + 2y + z + 4 = 0

Therefore, an equation of the plane containing the three given points and with a normal vector perpendicular to the line is -2x + 2y + z + 4 = 0.

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The balanced equation of the chemical reaction is  3K₂S + 2AlCl₃ → 6KCl + Al₂S₃ .

The balanced equation of the chemical reaction is calculated as follows;

The given chemical equation;

K₂S+ AlCl₃ → KCl + Al₂S₃

The balanced chemical equation is obtained by adding coefficient to each of the molecule in order to balance the number of atoms on the right and on the left.

The balanced equation of the chemical reaction becomes;

3K₂S + 2AlCl₃ → 6KCl + Al₂S₃

In the equation above we can see that;

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To find the double integral of f(x, y) = 3/2x + y² over the region R bounded by the circular arc x² + y² = 1 above the x-axis, we can use a coordinate transformation to convert the integral into polar coordinates.

In polar coordinates, the circular arc x² + y² = 1 corresponds to the equation r = 1, where r is the distance from the origin to a point on the curve. The region R can be represented in polar coordinates as 0 ≤ θ ≤ π, where θ is the angle measured from the positive x-axis to the point on the curve.

To perform the coordinate transformation, we substitute x = rcosθ and y = rsinθ into the integrand f(x, y):

f(x, y) = 3/2x + y²

= 3/2(rcosθ) + (rsinθ)²

= 3/2rcosθ + r²sin²θ.

The Jacobian determinant for the coordinate transformation from (x, y) to (r, θ) is r, so the double integral becomes:

∬R f(x, y) dA = ∫₀ᴨ ∫₀¹ (3/2rcosθ + r²sin²θ) r dr dθ.

Now, we can evaluate the double integral by integrating first with respect to r from 0 to 1, and then with respect to θ from 0 to π. This will give us the value of the integral over the region R bounded by the circular arc x² + y² = 1 above the x-axis.

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To find the slope of the line tangent to the graph of the function y = x^4 + 3x^3 - 2x - 2 at the given value of x = -3, we need to find the derivative of the function and evaluate it at x = -3.

Let's find the derivative of the function y = x^4 + 3x^3 - 2x - 2 using the power rule:

dy/dx = 4x^3 + 9x^2 - 2

Now, substitute x = -3 into the derivative:

dy/dx = 4(-3)^3 + 9(-3)^2 - 2

      = 4(-27) + 9(9) - 2

      = -108 + 81 - 2

      = -29

Therefore, the slope of the line tangent to the graph of the function at x = -3 is -29.

So, the answer is D) -29

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To find the critical values of the function f(x) = (x²-16)6, we need to determine where the derivative of the function is equal to zero or undefined.

First, let's find the derivative of f(x) with respect to x:

f'(x) = 6(x²-16)' = 6(2x) = 12x

Now, to find the critical values, we set the derivative equal to zero and solve for x:

12x = 0

Solving this equation, we find that x = 0.

So, the critical value of f is x = 0.

Therefore, the only critical value of f(x) = (x²-16)6 is x = 0.

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The highest concentration occurs at approximately t = 0.405 hours within the first 2 hours.

In mathematics, a function is a unique arrangement of the inputs (also referred to as the domain) and their outputs (sometimes referred to as the codomain), where each input has exactly one output and the output can be linked to its input.

To find the time at which the highest concentration occurs within the first 2 hours, we need to determine the maximum value of the concentration function C(t) = 10([tex]e^{(-2t)} - e^{(-3t)}[/tex]) within the interval 0 ≤ t ≤ 2.

To find the maximum, we can take the derivative of C(t) with respect to t and set it equal to zero:

[tex]dC/dt = -20e^{(-2t)} + 30e^{(-3t)[/tex]

Setting dC/dt = 0, we can solve for t:

[tex]-20e^{(-2t)} + 30e^{(-3t)} = 0[/tex]

Dividing both sides by [tex]10e^{(-3t)}[/tex], we get:

[tex]-2e^{(t)} + 3 = 0[/tex]

Simplifying further:

[tex]e^{(t)} = 3/2[/tex]

Taking the natural logarithm of both sides:

t = ln(3/2)

Using a calculator, we find that ln(3/2) is approximately 0.405.

Therefore, the highest concentration occurs at approximately t = 0.405 hours within the first 2 hours.

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The second Taylor polynomial, T2(x), for the function f(x) = e^(x^2) based at b = 0 is given by:

T2(x) = f(b) + f'(b)(x - b) + f''(b)(x - b)^2/2!

To find T2(x), we need to evaluate f(b), f'(b), and f''(b). In this case, b = 0. Let's calculate these derivatives step by step.

First, we find f(0). Plugging b = 0 into the function, we get f(0) = e^(0^2) = e^0 = 1.

Next, we find f'(x). Taking the derivative of f(x) = e^(x^2) with respect to x, we have f'(x) = 2x * e^(x^2).

Now, we evaluate f'(0). Plugging x = 0 into f'(x), we get f'(0) = 2(0) * e^(0^2) = 0.

Finlly, we find f''(x). Taking the derivative of f'(x) = 2x * e^(x^2) with respect to x, we have f''(x) = 2 * e^(x^2) + 4x^2 * e^(x^2).

Evaluating f''(0), we get f''(0) = 2 * e^(0^2) + 4(0)^2 * e^(0^2) = 2.

Now, we have all the values needed to construct T2(x):

T2(x) = 1 + 0(x - 0) + 2(x - 0)^2/2! = 1 + x^2.

Therefore, the second Taylor polynomial T2(x) for f(x) = e^(x^2) based at b = 0 is T2(x) = 1 + x^2.

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1a. The number of black ink cartridges is 54

1b. The number of colored ink cartridges is 0.

1a. The number of black ink cartridges sold can be calculated by dividing the total cost of black ink cartridges by the cost of a single black ink cartridge.

Total cost of black ink cartridges = $1089.45

Cost of a single black ink cartridge = $19.99

Number of black ink cartridges sold = Total cost of black ink cartridges / Cost of a single black ink cartridge

                                    = $1089.45 / $19.99

                                    ≈ 54.48

Since we cannot have a fraction of a cartridge, we round down to the nearest whole number. Therefore, approximately 54 black ink cartridges were sold.

1b. To determine the number of colored ink cartridges sold, we can subtract the number of black ink cartridges sold from the total number of cartridges sold.

Total number of cartridges sold = 54

Number of colored ink cartridges sold = Total number of cartridges sold - Number of black ink cartridges sold

                                       = 54 - 54

                                       = 0

From the given information, it appears that no colored ink cartridges were sold during the fall semester. Only black ink cartridges were purchased.

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Consequently, it may be said that that "Alternating Series test cannot be used because b_n = 2" is untrue.

We can in fact use the Alternating Series Test to assess whether the provided alternating series (sum_n=1infty (-1)n frac23n + 2) is converging.

According to the Alternating Series Test, if a series satisfies both of the following requirements: (1) a_n is positive and decreases as n rises; and (2) lim_ntoinfty a_n = 0, the series converges.

In this instance, (a_n = frac2 3n + 2)). We can see that "(a_n)" is positive for all "(n"), and that "(frac23n + 2)" lowers as "(n") grows. In addition, (frac 2 3n + 2) gets closer to 0 as (n) approaches infinity.

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The Root cause analysis uses one of the following techniques is (D) Ishikawa diagram.

The Root cause analysis is a problem-solving technique that aims to identify the underlying reasons or causes of a particular problem or issue.

It helps in identifying the root cause of a problem by breaking it down into its smaller components and analyzing them using a systematic approach.

The Ishikawa diagram, also known as a fishbone diagram or cause-and-effect diagram, is one of the most widely used techniques for conducting root cause analysis.

It is a visual tool that helps in identifying the possible causes of a problem by categorizing them into different branches or categories.

The Ishikawa diagram can be used in various industries, including manufacturing, healthcare, and service industries, and can help in improving processes, reducing costs, and increasing efficiency.

In summary, the root cause analysis technique uses the Ishikawa diagram to identify the underlying reasons for a particular problem.

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The function f(x) is discontinuous at x = 0 and the discontinuity is not removable. The function is continuous everywhere else.

The function f(x) is said to be discontinuous at a point x = a if one or more of the following conditions are met:

1. The limit of f(x) as x approaches a does not exist.

2. The limit exists but is not equal to f(a).

3. The function has a jump discontinuity at x = a, meaning there is a finite gap in the graph of the function.

In this case, the function f(x) is defined as follows:

f(x) =

70, if x = 0

x, if x ≠ 0

At x = 0, the limit of f(x) as x approaches 0 is not equal to f(0). The limit of f(x) as x approaches 0 from the left side is 0, while the limit as x approaches 0 from the right side is 0. However, f(0) is defined as 70, which is different from both limits.

The notion of limit is closely related to continuity. A function is continuous at a point x = a if the limit of the function as x approaches a exists and is equal to the value of the function at a. In other words, the function has no sudden jumps, holes, or breaks at that point. Continuity implies that the graph of the function can be drawn without lifting the pen from the paper. Discontinuity, on the other hand, indicates a point where the function fails to meet the conditions of continuity.

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The absolute maximum value of the function k(x, y) = -x² - y² + 12x + 12y, subject to the given constraints, occurs at the point (7, 0) with a value of 49. The absolute minimum value occurs at the point (0, 14) with a value of -140.

To find the absolute maximum and minimum values of the function k(x, y) subject to the given constraints, we need to evaluate the function at the critical points and the endpoints of the feasible region.

The feasible region is defined by the constraints 0 ≤ x ≤ 7, y ≥ 0, and x + y ≤ 14. The boundary of this region consists of the lines x = 0, y = 0, and x + y = 14.

First, we evaluate the function k(x, y) at the critical points, which are the points where the partial derivatives of k(x, y) with respect to x and y are equal to zero. Taking the partial derivatives, we get:

∂k/∂x = -2x + 12 = 0,

∂k/∂y = -2y + 12 = 0.

Solving these equations, we find the critical point to be (6, 6). We evaluate k(6, 6) and find that it equals 0.

Next, we evaluate the function k(x, y) at the endpoints of the feasible region. We compute k(0, 0) = 0, k(7, 0) = 49, and k(0, 14) = -140.

Finally, we compare the values of k(x, y) at the critical points and endpoints. The absolute maximum value of 49 occurs at (7, 0), and the absolute minimum value of -140 occurs at (0, 14).

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The correct answer is D) a(t) = 9t to the problem if s is a distance given by s(t) = 313+t+ 4.

To find the acceleration, we need to take the second derivative of the distance function s(t) = 313 + t + 4 with respect to time t.

Given: s(t) = 313 + t + 4

First, let's find the first derivative of s(t) with respect to t:

s'(t) = d(s(t))/dt = d(313 + t + 4)/dt

= d(t + 317)/dt

= 1

The first derivative gives us the velocity function v(t) = s'(t) = 1.

Now, let's find the second derivative of s(t) with respect to t:

a(t) = d²(s(t))/dt² = d²(1)/dt²

= 0

The second derivative of the distance function s(t) is zero, indicating that the acceleration is constant and equal to zero. Therefore, the correct answer is D) a(t) = 9t.

This means that the object described by the distance function s(t) = 313 + t + 4 is not accelerating. Its velocity remains constant at 1, and there is no change in acceleration over time.

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The limit of f(x, y) as (x, y) approaches (0, 0) will be 0 the given function f(x, y) = |x| (x² + y²)k exists and is equal to 0, both when k ≤ 0 and k > 0.

The limit of f(x, y) exists as (x, y) approaches (0, 0) for a given constant k, consider the cases of k ≤ 0 and k > 0 separately.

Case 1: k ≤ 0

The function f(x, y) = |x| (x² + y²)k as (x, y) approaches (0, 0).

That when k ≤ 0, the expression (x² + y²)k defined, including when (x, y) approaches (0, 0) the term |x| may introduce some complications.

Consider the limit of f(x, y) as (x, y) approaches (0, 0):

lim┬(x,y→(0,0)) f(x, y) = lim┬(x,y→(0,0)) |x| (x² + y²)k.

Since (x² + y²)k is always defined and non-negative, the limit will depend on the behavior of |x| as (x, y) approaches (0, 0).

An (0, 0) along the x-axis (y = 0), then |x| = x the limit becomes

lim┬(x→0) f(x, 0) = lim┬(x→0) x (x² + 0)k = lim┬(x→0) x^(1 + 2k).

If k ≤ 0, then 1 + 2k ≤ 1, which means that x^(1 + 2k) approaches 0 as x approaches 0. The limit of f(x, 0) as x approaches 0 will be 0.

The limit as (x, y) approaches (0, 0) along any other path |x| positive, and the expression (x² + y²)k will remain non-negative. The overall limit will still be 0, regardless of the specific path taken.

Hence, when k ≤ 0, the limit of f(x, y) as (x, y) approaches (0, 0) is always 0.

Case 2: k > 0

The function f(x, y) = |x| (x² + y²)k as (x, y) approaches (0, 0).

(x² + y²)k is always defined and non-negative as (x, y) approaches (0, 0). The main difference is that |x| be positive.

Consider the limit of f(x, y) as (x, y) approaches (0, 0):

lim┬(x,y→(0,0)) f(x, y) = lim┬(x,y→(0,0)) |x| (x² + y²)k.

Since |x| is always positive, the limit will depend on the behavior of (x² + y²)k as (x, y) approaches (0, 0).

An (0, 0) along any path, the term (x² + y²)k will approach 0. This is because when k > 0, raising a positive value (x² + y²) to a positive power k will result in a value approaching 0 as (x, y) approaches (0, 0).

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The given series Σ (40 + 15 - n) diverges. When we say that a series diverges, it means that the series does not have a finite sum. In other words, as we add up the terms of the series, the partial sums keep growing without bound.

To determine the convergence or divergence of the series Σ (40 + 15 - n), we need to examine the behavior of the terms as n approaches infinity.

The given series is:

40 + 15 - 1 + 40 + 15 - 2 + 40 + 15 - 3 + ...

We can rewrite the series as:

(40 + 15) + (40 + 15) + (40 + 15) + ...

Notice that the terms 40 + 15 = 55 are constant and occur repeatedly in the series. Therefore, we can simplify the series as follows:

Σ (40 + 15 - n) = Σ 55

The series Σ 55 is a series of constant terms, where each term is equal to 55. Since the terms do not depend on n and are constant, this series diverges.

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The total distance the ball travels is the sum of the distances it travels while falling and while bouncing. The ball travels a total distance of 45 feet.

When the ball is dropped from a height of 15 feet, it falls and covers a distance of 15 feet. After hitting the ground, it bounces back to a height that is 80% of the height from which it last fell, which is 80% of 15 feet, or 12 feet. The ball then falls from a height of 12 feet, covering an additional distance of 12 feet. This process continues until the ball stops bouncing.

To calculate the total distance the ball travels, we can sum up the distances traveled during each fall and each bounce. The distances traveled during each fall form a geometric sequence with a common ratio of 1, since the ball falls from the same height each time. The sum of this geometric sequence can be calculated using the formula for the sum of an infinite geometric series:

Sum = a / (1 - r),

where "a" is the first term of the sequence and "r" is the common ratio. In this case, "a" is 15 feet and "r" is 1.

Sum = 15 / (1 - 1) = 15 / 0 = undefined.

Since the sum of an infinite geometric series with a common ratio of 1 is undefined, the ball does not travel an infinite distance. Instead, we know that after each bounce, the ball falls and covers a distance equal to the height from which it last fell. Therefore, the total distance the ball travels is the sum of the distances traveled during the falls. The total distance is 15 + 12 + 12 + ... = 15 + 15 + 15 + ... = 45 feet.

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To solve the separable differential equation 9dz/dt = 1 and find the particular solution satisfying the initial condition z(0) = 9, we can follow these steps:

First, let's separate the variables by moving the dz term to one side and the dt term to the other side: dz = dt/9. Now, we can integrate both sides of the equation. Integrating dz gives us z, and integrating dt/9 gives us (1/9)t + C, where C is the constant of integration. Therefore, we have:z = (1/9)t + C.

To find the particular solution satisfying the initial condition z(0) = 9, we substitute t = 0 and z = 9 into the equation: 9 = (1/9)(0) + C, 9 = C. Hence, the constant of integration is C = 9. Substituting this value back into the equation, we have: z = (1/9)t + 9.

Therefore, the particular solution of the separable differential equation 9dz/dt = 1 satisfying the initial condition z(0) = 9 is given by z = (1/9)t + 9.

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The concentration of salt in the tank at any given time can be described by the equation C(t) = e^(-k * t + ln(0.015)), and the amount of salt in the tank after 20 minutes depends on the value of k and the volume of the tank.

To solve this problem, we need to consider the rate of salt entering and leaving the tank over time.

(a) After t minutes:

The rate of salt entering the tank is constant because pure water is being added. The rate of salt leaving the tank is proportional to the concentration of salt in the tank at any given time.

Let's define the concentration of salt in the tank at time t as C(t) (in kg/L). Initially, the concentration of salt is 15 kg/1000 L, which can be written as C(0) = 15/1000 = 0.015 kg/L.

Since pure water enters the tank at a rate of 10 L/min, the rate of salt entering the tank is 0 kg/min because the water is salt-free.

The rate of salt leaving the tank is proportional to the concentration of salt in the tank at any given time. Let's call this rate k. So, the rate of salt leaving the tank is k * C(t).

Using the principle of conservation of mass, the change in the amount of salt in the tank over time is equal to the difference between the rate of salt entering and the rate of salt leaving:

dS(t)/dt = 0 - k * C(t),

where dS(t)/dt represents the derivative of the amount of salt in the tank with respect to time.

We can solve this first-order ordinary differential equation to find an expression for C(t):

dS(t)/dt = - k * C(t),

dS(t)/C(t) = - k * dt.

Integrating both sides:

∫(dS(t)/C(t)) = ∫(- k * dt),

ln(C(t)) = - k * t + C,

where C is a constant of integration.

Solving for C(t):

C(t) = e^(-k * t + C).

To determine the constant of integration C, we can use the initial condition that C(0) = 0.015 kg/L:

C(0) = e^(-k * 0 + C) = e^C = 0.015,

C = ln(0.015).

Therefore, the equation for C(t) is:

C(t) = e^(-k * t + ln(0.015)).

Now, we need to find the value of k. Since the tank contains 1000 L of brine with 15 kg of dissolved salt initially, we have:

C(0) = 15 kg / 1000 L = 0.015 kg/L,

C(t) = e^(-k * t + ln(0.015)).

Substituting t = 0 and C(0) into the equation:

0.015 = e^(-k * 0 + ln(0.015)),

0.015 = e^ln(0.015),

0.015 = 0.015.

This equation is satisfied for any value of k, so k can take any value.

In summary, the concentration of salt in the tank at time t is given by:

C(t) = e^(-k * t + ln(0.015)).

To find the amount of salt in the tank at time t, we multiply the concentration by the volume of the tank:

Amount of salt in the tank at time t = C(t) * Volume of the tank.

(b) After 20 minutes:

To find the amount of salt in the tank after 20 minutes, we substitute t = 20 into the equation for C(t) and multiply by the volume of the tank:

Amount of salt in the tank after 20 minutes = C(20) * Volume of the tank.

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The scalar projection of (5, 9) onto (8, -7) is approximately -0.203 and the vector projection is (-184 / 113, 161 / 113).

To find the scalar projection of a vector (5, 9) onto another vector (8, -7), we use the formula: Scalar Projection = (Vector A • Vector B) / ||Vector B|| where Vector A • Vector B represents the dot product of the two vectors and ||Vector B|| represents the magnitude of Vector B. Let's calculate the scalar projection: Vector A • Vector B = (5 * 8) + (9 * -7) = 40 - 63 = -23 ||Vector B|| = √(8^2 + (-7)^2) = √(64 + 49) = √113

Scalar Projection = (-23) / √113. To find the vector projection, we multiply the scalar projection by the unit vector in the direction of Vector B: Vector Projection = Scalar Projection * (Unit Vector B). To find the unit vector in the direction of Vector B, we divide Vector B by its magnitude: Unit Vector B = (8, -7) / ||Vector B|| Unit Vector B = (8 / √113, -7 / √113)

Now we can calculate the vector projection: Vector Projection = Scalar Projection * (Unit Vector B). Vector Projection = (-23 / √113) * (8 / √113, -7 / √113). Simplifying, Vector Projection = (-23 * 8 / 113, -23 * -7 / 113). Vector Projection = (-184 / 113, 161 / 113). Therefore, the scalar projection of (5, 9) onto (8, -7) is approximately -0.203 and the vector projection is (-184 / 113, 161 / 113).

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The probability that the first student Mr. Beal selects has a pass or has completed the homework assignment is approximately 52%. c.

To find the probability that the first student Mr. Beal selects has a pass or has completed the homework assignment, we need to calculate the probability based on the given information.

Let's define the following events:

A: The selected student has a pass.

B: The selected student has completed the homework assignment.

Given information:

P(A) = 9/43 (probability that a student has a pass)

P(B) = 18/43 (probability that a student has completed the homework assignment)

P(A and B) = 7/43 (probability that a student has a pass and has completed the homework assignment)

We can use the principle of inclusion-exclusion to find the probability of the union of events A and B.

P(A or B) = P(A) + P(B) - P(A and B)

Plugging in the values, we get:

P(A or B) = (9/43) + (18/43) - (7/43)

= 27/43

To express the probability as a percentage, we multiply by 100:

P(A or B) = (27/43) × 100

≈ 62.79

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The ratio of students who secured grades A,B,C and D​ is 9 : 15 : 4 : 2

From the question, we have the following parameters that can be used in our computation:

Students = 60

A = 18

B = 30

C = 8

D = 4

When represented as a ratio, we have

Ratio = A : B : C : D

substitute the known values in the above equation, so, we have the following representation

A : B : C : D = 18 : 30 : 8 : 4

Simplify

A : B : C : D = 9 : 15 : 4 : 2

Hence, the ratio of students who secured grade A,B,C and D​ is 9 : 15 : 4 : 2

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The value of function (fg)(6) = 79.

The given functions are f(x) = x + 3 and g(x) = x² - 2. The product of two functions can be determined by performing the operation for each term of each function.

Then, replace x in the second function by the resulting operation from the first function. Then simplify the resulting expression.

(fg)(6) can be evaluated as follows:

First, determine f(6) = 6 + 3 = 9

Then, determine g(6) = 6² - 2 = 34

Now, replace x in g(x) with f(6), which gives: g(f(6)) = g(9) = 9² - 2 = 79

Therefore, (fg)(6) = 79.

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The total fuel consumption from 6 AM to 1 PM is approximately 39.48 barrels.

To find the average rate of consumption from 6 AM to 1 PM, we need to calculate the total fuel consumption during that time period and divide it by the duration.

The given formula for fuel consumption is f(t) = 0.4t^2 - 0.16t + 21, where t represents the time in hours after 6 AM.

To determine the total fuel consumption from 6 AM to 1 PM, we need to substitute the values of t for the respective time periods. From 6 AM to 1 PM is a duration of 7 hours.

Substituting t = 7 into the formula, we get:

f(7) =[tex]0.4(7)^2[/tex] - 0.16(7) + 21

     = 0.4(49) - 1.12 + 21

     = 19.6 - 1.12 + 21

     = 39.48 barrels of fuel oil.

Therefore, the total fuel consumption from 6 AM to 1 PM is approximately 39.48 barrels.

To calculate the average rate of consumption, we divide the total fuel consumption by the duration:

Average rate of consumption = Total fuel consumption / Duration

                          = 39.48 barrels / 7 hours

                          ≈ 5.64 barrels per hour.

Rounding the average rate of consumption to two decimal places, we find that the average rate of consumption from 6 AM to 1 PM is approximately 5.64 barrels per hour.

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To compute the limit as x approaches 0 of cos(4x) - 1, the standard limit properties and trigonometric identities is used without using l'Hôpital's Rule.

Let's evaluate the limit using basic properties of limits and trigonometric identities. As x approaches 0, we have:

lim(x→0) cos(4x) -

Using the identity cos(0) = 1, we can rewrite the expression as:

lim(x→0) cos(4x) - cos(0)

Next, we can use the trigonometric identity for the difference of cosines:

cos(A) - cos(B) = -2sin((A + B)/2)sin((A - B)/2)

Applying this identity, we can rewrite the expression as

lim(x→0) -2sin((4x + 0)/2)sin((4x - 0)/2)

Simplifying further, we get:

lim(x→0) -2sin(2x)sin(2x)

Since the sine function is well-known to have a limit of 1 as x approaches 0, we can simplify the expression to:

lim(x→0) -2(1)(1) = -2

Therefore, the limit of cos(4x) - 1 as x approaches 0 is equal to -2.

Note: In this calculation, we did not utilize l'Hôpital's Rule, as it is not necessary for evaluating the given limit. By using trigonometric identities and the basic properties of limits, we were able to simplify the expression and determine the limit directly.

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The given function 21 has a domain D of all real numbers. The x-intercept is (0, 0), the y-intercept is (0, 131).

The limit of the function as x approaches an accumulation point of D, which is not in D, does not exist. There are no asymptotes. The limit as x approaches infinity is 1, and there are no asymptotes.

The derivative of the function is [tex]f'(x) = 3x^2 - 4x + 1.[/tex] The function has a critical number at x = 2/3. It increases on (-∞, 2/3) and decreases on (2/3, +∞). The concavity of the function is positive and there are no points of inflection.

a) The function 21 has a domain D of all real numbers since there are no restrictions on the input values.

b) To find the x-intercept, we set y = 0 and solve for x. Plugging in y = 0 into the equation 21, we get 21 = 0, which is not possible. Therefore, there is no x-intercept.

To find the y-intercept, we set x = 0 and solve for y. Plugging in x = 0 into the equation 21, we get y = 131. So the y-intercept is (0, 131).

c) The limit of the function as x approaches an accumulation point of D, which is not in D, does not exist. The function may exhibit oscillations or diverge in such cases.

d) There are no asymptotes for the function 21.

e) As x approaches infinity, the limit of the function is 1. There are no horizontal or vertical asymptotes.

f) The derivative of the function can be found by differentiating the equation 21 with respect to x. The derivative is [tex]f'(x) = 3x^2 - 4x + 1[/tex].

g) The critical numbers of the function are the values of x where the derivative is equal to zero or undefined. By setting f'(x) = 0, we find that x = 2/3 is a critical number.

h) The function increases on the interval (-∞, 2/3) and decreases on the interval (2/3, +∞).

i) The concavity of the function can be determined by examining the second derivative. However, since the second derivative is not provided, we cannot determine the concavity or points of inflection.

j) A well-labeled graph of the function 21 can be sketched to visualize its behavior and characteristics.

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