Title: Math 7 Review Expressions
Course: quiz duplicate error

Q: Simplify the expression by combining like terms.

12x - x - 2x + x
- 10x (correct)
- x^2 + 10x (incorrect)
- 12x (incorrect)
- -x^2 + 10x (incorrect)
A: 10x

Q: Simplify the expression by combining like terms.

9x - 4 + 4x + 2
- 11x (incorrect)
- 11 (incorrect)
- 13x - 2 (correct)
- 5x - 2 (Incorrect. 9x and 4x are both positive.)
A: 13x - 2

Q: Multiply.

9(5x + 8)
- 117x (incorrect)
- 14x + 72 (incorrect)
- 45x + 72 (correct)
- 14x + 17 (incorrect)
A: 45x + 72

Q: Multiply: -2(5 – 3x)
- -10 – 3x
- -10 + 3x
- -10 – 6x
- -10 + 6x
A: -10 + 6x

Q: Use the distributive property to simplify the expression.

-(-7t - 6r - 6s)
- 7t + 6r - 6s (incorrect)
- 7t + 6r + 6s (correct)
- -7t - 6r + 6s (incorrect)
- -7t - 6r - 6s (incorrect)
A: 7t + 6r + 6s

Q: Simplify the expression.

8(-6x + 2) + 7(x - 4)
- -41x - 12 (correct)
- 8x - 12 (incorrect)
- -41x - 2 (incorrect)
- -60x (incorrect)
A: -41x - 12

Q: Simplify the expression.

4(7x - 1) - 6(x - 4)
- 22x + 20 (correct)
- 22x - 28 (incorrect)
- 22x - 5 (incorrect)
- 4x + 20 (incorrect)
A: 22x + 20

Q: Factor the expression:

30x - 12
- 6(5x - 2)
- 30(x - 12) (That would give you 30*12)
- 12(30x - 1) (That would give you 12*30)
- 3(5x - 8)
- 12(3x - 1) (12*3 = 36, not 30)
A: 6(5x - 2)

Q: Factor the expression:  6m + 9
A: 3(2m + 3) / 3(2m+3)

Q: Write the phrase as an algebraic expression. Let x represent the unknown number.

Twice a number, decreased by 71
- 71 - 2x (incorrect)
- 2x - 71 (correct)
- 2x + 71 (incorrect)
- x - 71 (incorrect)
A: 2x - 71

Q: Heather spent ¼ of the money in her savings account on a new cell phone. Represent the amount of money Heather spent on the new cell phone.
- s + 1/4
- s – 1/4
- s ÷ 1/4
- s/4
A: s/4

Q: Evaluate.

8y- 4, for y = 3
- 28
- 19
- 20
- 29
A: 20

Q: Evaluate \[\frac{20-x}{-3x}\] for x = -4
A: 2
Feedback ("-2"): A negative multiplied to a negative is always positive, so the denominator is positive.

Q: Rewrite the expression using the distributive property:

-6(4 + \[\frac{1}{2}\])
- -6(4) + \[\frac{1}{2}\]
- -6(4) + -6(\[\frac{1}{2}\])
- 4 + -6(\[\frac{1}{2}\])
- -10(\[\frac{1}{2}\])
A: -6(4) + -6(\[\frac{1}{2}\])

Q: Simplify the expression.

4(4x - 9) + 7x
- 23x - 36 (correct)
- 9x - 36 (incorrect)
- 9x + 36 (incorrect)
- 23x + 36 (incorrect)
A: 23x - 36

Q: Simplify the expression.

7(6z + 4) - 2
- 42z + 26 (correct)
- 30z + 20 (incorrect)
- 13z + 9 (incorrect)
- 42z + 2 (incorrect)
A: 42z + 26