Please help me :(, I want to understand how to prove it

Answer:

1 cookie = $1.25    1 cake = $15

Step-by-step explanation:

set up a system of equations:

let x = 1 cookie

let y = 1 cake

3x + 5y = 78.75

8x + 2y = 40

I multiplied the first equation by 2 to get:  6x + 10y = 157.50

I multiplied the second equation by -5 to get:  -40x - 10y = -200.00

If you add both equations, the y-terms will be eliminated

-34x = -42.50

x = 1.25

Plug in 1.25 into equation to find value of y:  8(1.25) + 2y = 40

                                                                           10 + 2y = 40

                                                                            2y = 30

                                                                             y = 15

Answer: $14.40

Step-by-step explanation:

Answer: 6

Step-by-step explanation:

Answer:

c

Step-by-step explanation:

Answer:

that student made a error on his graph because the equation y<0.5x+1 doesn't show.

Step-by-step explanation:

Answer: x = 5

Step-by-step explanation:

Hey there! If you have any questions, feel free to let me know in the comments.

Step 1: Simplify  20 - 4x - 15 - 4x  to  5 - 8x.

5 - 8x = -6x - 45 + 8x

Step 2: Simplify -6x - 45 + 8x to 2x - 45.

5 - 8x = 2x-44

Step 3: Add 8x to both sides.

5 = 2x - 45 + 8x

Step 4: Simplify 2x - 45 + 8x to 10x - 45.

5 = 10x - 45

Step 5: Add 45 to both sides.

5 + 45 = 10x

Step 6: Simplify 5 + 45 to 50.

50 = 10x

Step 7: Divide both sides by 10.

50/10 = 10x/10

Step 8: Simplify 50/10 to 5.

x = 5

Answer:

Step-by-step explanation:

Here you go mate

step 1

20-4x-15-4x=-6x-45+8x  equation

step 2

20-4x-15-4x=-6x-45+8x  simplify for x

20+(-4x)+(-15)+(-4x)=(-6x)+(-45)+8x

step 3

(-4x+-4x)+(20+(-15)=(-6x+8x)+(-45)  add brackets to seperate the equations

step 4

-8x+5=2x+-45  combine the terms that are alike

step 5

-8x+5(-2x)=2x-45(-2x)  subtract -2x(the ones in the brackets)

-10x+5=-45

step 6

−10x+5(-5)=−45(-5)  subtract -5

-10x=-50

step 7

-10x/-10=-50/-10  divide by -10

step 8

50/10  Divide

Answer

x=5

Answer:

10 feet

Step-by-step explanation:

You use the pythagorean theorem to find the missing side of a right triangle.

side^2 + side^2 = hypotenuse ^2

6^2 + 8^2 = X^2

36 + 64 = 100

square root of 100 = 10

Answer:

the mean would increase

Step-by-step explanation:

it would increase because you add up and devid by how many numbers you have

Answer

25/9

Step-by-step explanation:

70 + 20 =90

25/9 x 90 = 250

Answer:

(1,6)

Step-by-step explanation:

In order to reflect a point over a horizontal line, you need to count how many units it takes to reach that line (going vertically). Once you have that number, count that many units starting from that point on the line (again, going vertically), then that is your reflected point.

Counting from point Q to the line y = 2, it takes 4 units. So starting from that point on the line where I left off, I would count another 4 units, taking me to (1,6). The picture below explains it better visually.

Answer:

380

Step-by-step explanation:

Find 1% of e:

180 / 45 = 4

Find 95% of e:

4 * 95 = 380

Answer:

96 pizzas

Step-by-step explanation:

Allan can make 8 pizzas in 15 minutes at the pizza restaurant where he works.

We are told that;

If the number of pizzas varies directly with minutes,

P ∝ M

P = kM

Hence:

8 = 15k

k = 8/15

How many pizzas can Allan make in 3 hours?

Convert 3 hours to minutes

1 hour = 60 minutes

3 hours = x

x = 3 × 60

x = 180 minutes

Hence,

M = 180 minutes

k = 8/15

P = kM

P = 8/15 × 180

P = 96 pizzas

Therefore, Allan can make 96 pizzas in 3 hours

Answer:

Stefan uses 500 grams of sugar with 10 egg whites.

Step-by-step explanation:

Given that Stefan is using 50 grams of sugar with one egg white.

In order to find the quantity of sugar for more eggs, we have to multiply the amount of sugar for one egg with number of eggs.

Now,

We have to find the quantity of sugar for 10 eggs.

[tex]Sugar\ for\ 10\ eggs = 10*50 = 500[/tex]

Hence,

Stefan uses 500 grams of sugar with 10 egg whites.

Answer:

500 grams

Step-by-step explanation:

Answer:

Q: How long will it take to go 12.75 miles?

A: 85 seconds

Step-by-step explanation:

d = 0.15t

12.75 = 0.15t

0.15/ 12.75 = 85

Sorry,I don't know how to answer the first question(How fast is it flying?)

Hoped this helped though in some way

Answer:

f(x) + g(x) = x² - 10x + 9

General Formulas and Concepts:

Algebra I

Step-by-step explanation:

Step 1: Define

f(x) = x² - 11x + 18

g(x) = x - 9

Step 2: Find f(x) + g(x)

Answer:

F=95

L=70

Step-by-step explanation:

3L+2F=400

2L+3F=425

Plug in and substitute

F=95

L=70

(Can I get brainliest please)

Answer:

lemon cookies = 70 calories

fudge cookies = 95 calories

Step-by-step explanation:

Lemon cookies = "x"

Fudge cookies = "y"

As per what is given;

3x + 2y = 400

2x + 3y = 425

Multiply the first equation by (-3), and the second by (2)

-9x - 6y = -1200

4x + 6y = 850

________________

-5x = - 350

Inverse operations;

-5x = -350

/-5      /-5

x = 70

Subsitute back in;

3x + 2y = 400

3(70) + 2y = 400

Simplify, inverse operations;

210 + 2y = 400

-210           -210

2y = 190

y = 95

Answer:   The height is 3  units.

Step-by-step explanation:

By using the give figure we can form right angle out of the whole figure  with a base of  4  and an hypotenuse of 5.

By using this information we can use the Pythagorean Formula to find the height

a^2 + b^2 =c^2     a= base, b = height and c will be the hypotenuse.

4^2 + b^2 = 5^2     Solve for B

16  + B^2 = 25  

-16               -16

    b^2 = 9    

    b = [tex]\sqrt{9}[/tex]  

  b  = 3

The height, h, of the triangular prism is 3 units.

Isosceles triangles are those triangles that have at least two sides of equal measure and two base angles are equal.

Given that, vertical cross-section of the triangular prism shown in the given figure is an isosceles triangle.

Here, equal sides of an isosceles triangle is 5 units and base of the isosceles triangle is 8 units.

By using Pythagoras theorem,

5²=h²+4²

25=h²+16

h²=9

h=3

Therefore, the height, h, of the triangular prism is 3 units.

To learn more about an isosceles triangle visit:

https://brainly.com/question/10147636.

#SPJ7

Answer:

The correct option is;

B

Step-by-step explanation:

The given system of inequalities are;

5·x - 4·y > 4...(1)

x + y < 2...(2)

Representing both inequalities as a function of "y", gives;

For, 5·x - 4·y > 4...(1), we have;

-4·y > 4 - 5·x

y < 4/(-4) - 5·x/(-4)

∴ y < 5·x/4 - 1

For x + y < 2...(2), we have;

y < 2 - x

Therefore, y is less than the values given by the equation of the straight line equalities, and the feasible region is given by the common region under both dashed lines representing both inequalities as shown in the attached diagram created using Microsoft Excel

The correct option is therefore, B.

Answer:

x= 13

Step-by-step explanation:

Class- 4th question in India

Mark as Brainliest.

Because I am Indian and solving your question from India.

Answer:

15cm and 12cm

Step-by-step explanation:

From the question,The ratio of the length and breadth of a rectangle is 5 to 4

We assume The Lenght of the field= 5x

The breadth = 4x

Area= (5x × 4x)= 180

20x^2= 180

X^2=

X= √9

X=3cm

The Lenght of the field= 5×3= 15cm

The breadth = 4×3=12cm

Answer:

d [tex]\geq \\[/tex]-39

Step-by-step explanation:

d/13[tex]\geq \\[/tex]-3

multiply both sides by 13

d [tex]\geq[/tex] 13(-3)

d [tex]\geq[/tex] -39

hope this helps

Answer:

y = 12

Step-by-step explanation:

proportions can be solved by cross-multiplying

to work with smaller numbers, you can simplify [tex]\frac{14}{10}[/tex] to be [tex]\frac{7}{5}[/tex]

[tex]\frac{7}{5}[/tex] = [tex]\frac{y+9}{15}[/tex]

7(15) = 5(y + 9)

105 = 5y + 45

60 = 5y

y = 12

Answer:

According to my calculations, the correct answer is 1/16. Let me know if it comes as correct on your side. Thanks!

Step-by-step explanation:

Answer:

x = 175

Step-by-step explanation:

Add 8 on both sides to get 350 = 2x.  Divide 2 on both sides to get your x value which is 175.

Answer: I'm sure that x should be 30. And 42 should be 7. Then you can figure out what percent 7 is of 30.

Answer:

First choice, 50

Step-by-step explanation:

1/7 times 350 = 350/7 = 50