3.10 Test Review (Expressions and Equations)

A mathematical sentence that contains variables, constants, and operations is called...

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These are used to "undo" each other in order to find the solution in an equation...

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8(4 - 9) --> 8(4) + 8(-9) is called...

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Define a coefficient and give an example.

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Simplify the expression:

4(8x - 3)

• 12x - 12

• 24x - 1

• 32x - 12

• 32x + 12

Simplify the expression:

(4 - 9x - 3) 2

• 2 - 9x

• 8 - 18x

• -18x - 14

• 2 - 18x

Simplify the expression:

- 9m + 4 - 7m - 8

• -2m - 4

• -16m - 4

• -16m - 12

• 12 + 16m

Simplify the expression:

6y + 2(4 - y)

• 5y + 8

• 5y - 8

• 4y + 6

• 4y + 8

A triangle has side lengths 6w, w + 8, and 3w - 4

What expression represents the perimeter of the triangle? Also, what is the perimeter value if w = 2 ?

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Answer explanation

Perimeter means the sum of all the sides. So 6w + w + 8 + 3w - 4 = 10w + 4

When you substitute in 2 for w, you'd get 10(2) + 4 which equals 24

4 + w = -7