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3 years ago

Which value of a from the set {16, 18, 20, 22} makes the equation 2(42 - a) = 48 true?

1 answer:

7 0

a is equivalent to 18.

2(42 - a) = 48
2(42) + 2(-a) = 48 *distributive property of multiplication
84 - 2a = 48
-2a = 48 - 84
-2a = -36
-2a/-2 = -36/-2
a = 18

to check:
2(42-a) = 48
2(42-18) = 48
2(24) = 48
48 = 48

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3 years ago

A triangular pyramid and its net are shown. Rain uses Calculations below to conclude that the surface area of a triangular pyram

Harman [31]

Answer:

Rain is correct, calculates correctly, 238.5 square inches

Step-by-step explanation:

The given triangular pyramid is shown with the dimensions.

The surface area of the triangular pyramid is given by :

$A=\frac{1}{2}\left(a \times b\right) + 3\left(\frac{1}{2}\times b\times s\right)$

$A=\frac{1}{2}\left(10 \times 8.7\right) + 3\left(\frac{1}{2}\times 10\times 13\right)$

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3 years ago

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2 years ago

Y + 2x = 4 How do I complete this?

Leviafan [203]

To solve this, what you will need to do is find the solution of one variable and then substitute it and solve for the other.

Here’s how to solve:
y+2x=4
-2x -2x

y=4-2x

4-2x + 2x =4

4=4

So if you’re trying to see if it is true, then your answer is that it’s true.

If you’re trying to find the linear equation, then your answer is y=-2x+4.

3 0

2 years ago

SOMEONE HELP PLEASE !!! n^2 - m; use m = 7, and n = 8

gladu [14]

Answer:

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Step-by-step explanation:

Step 1: Define

n² - m

m = 7

n = 8

Step 2: Evaluate

Substitute: 8² - 7
Exponents: 64 - 7
Subtract: 57

7 0

2 years ago