How do you use equations to solve problems about area of Rectangles,Paralellograms , trapezoids and triangles

Answers

Answer 1

Answer: Each shape has a different formula for area. rectangles and parallelograms share the same formula, A=bh
Trapezoids formula is A= 1/2(b1 + b2)h
Triangles formula is A = 1/2bh
In all of these formulas, A means area, and h means the height of the shape. In the formulas for triangles and rectangles/parallelograms, b stands for the length of the base of the shape.
In the trapezoids formula, b1 means base 1 and b2 means base two, as a trapezoid has two different bases.
After finding all of the variables for the formula of the shape you're solving for, plug all the numbers into your missing variables, and solve as normal.

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David bought 3 dvds and 4 books for $40 at a yard sale. Anna bought 1 dvd and 6 books for $18. How much did each dvd and book cost?

Answers

Answer: d=$12, b=$1

d represents DVDs

b represets books

Step-by-step explanation:

Whenever you have 2 examples of 2 different things (such as books and dvds), make a systems of equations.

Step 1: Write a system of equations

3d+4b= 40

d+6b= 18

Step 2: Eliminate any letter. I'll just choose d.

To elimiate d, you have to make them both equal to the biggest d variable. In other words, make both d terms equal to 3d. To do this, miultiply the 2nd equation by 3, and keep the 1st one the same.

3d+4b=40

3d+18b= 54

Now, elimiate d, by doing 3d-3d= 0. Now use subtraction to solve for b since we used this to get 3 and 3 to 0.

4b-18b=40-54

-14b= -14

b= -14÷-14

b= 1

Each book costs 1 dollar.

Step 3: Plug in b=1 to find how much each dvd costs (plug into any equation)

3d+4b=40

3d+4(1)=40

3d+4=40

3d=40-4

3d=36

d=36÷3

d=12

Each dvd is $12

Step 4: Checks--plug d=12 and b=1 into any equation

3d+4b=40

3(12)+4(1)=40

36+4=40

40=40

It's correct ✅

Also i know this was answered really late but id appreciate if i could get brainliest as i worked pretty hard for this :) Hope i could help the best i could :D

PLEASE HELP I GIVE THANKS

Answers

it is 46 because if yo add both of the numbers you get 134 subtract 180 which is 46

The answer is C 46 degrees. This is found by adding the two known angles and subtracting that total from 180 degrees(the total degrees in a triangle). If you need any more help message me:)

What are the factor pairs of 52

Answers

Answer:

(1 and 52), (26 and 2), and (13 and 4)

Step-by-step explanation:

Answer:

1 x 52, 2 x 26, or 4 x 13.

Step-by-step explanation:

How many feet are in a mile

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1mile=5280 feet that is the correct answer

The answer to yoir question is:
1 mile = 5,280 feet

Use the Distributive Property to rewrite the expression. –6(r– 8)

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-6(r - 8) Original Mathematical Expression.

-6 * r + - 6 * -8 Distribute.

-6r + 48 Multiply.

48 - 6r Switch around expression.

Answer: -6r + 48 or 48 - 6r

Distributive property simplifies a expression.

-6(r-8)

(-6*r) - (8*-6)

-6r + 48

Final answer: -6r + 48

Ming-Li spent $15 at the movies. She then earned $30 babysitting. She spent $12 at the bookstore. She now has $18 left. How much money did Ming-Li have to begin with?

Answers

$21 I believe (it's 1 am where I am so I'm not 100% sure but I think it's correct)

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