Math 7 Final Review

Simplify the following - 8 - (-5)

• 13

• -13

• 3

• -3

Answer explanation

Remember subtraction is the same as adding the opposite so -8 + 5 = -3

During a game Gary lost 2 points, gained 8 points, gained another 4 points, and then lost 9 points. How many points did Gary lose or gain at the end of the game?

• gained 23 points

• gained 1 point

• lost 23 points

• lost 1 point

Answer explanation

-2 + 8 + 4 - 9 = 1

What is the charge of an atom that has 6 protons (positive charge) and 18 electrons (negative charge)?

• -12

• 12

• -23

• 23

Answer explanation

6 + -18 = -12

What is $\ \ \frac{12}{15}$  in simplest form?

•  $\frac{2}{5}$  

•  $\frac{3}{4}$  

•  $\frac{4}{5}$  

•  $\frac{1}{3}$  

Answer explanation

divide top and bottom by 3 to simplify

What is the simplified form of the expression below?

8m - 4 - 2m + 9

• 10m + 13

• 6m + 5

• 6m + 13

• 10m - 5

Answer explanation

Combine 8m and -2m to get 6m. Then do -4 + 9 to get 5. (6m + 5)

The expression is equivalent to the following?

3(2c - 6)

• 5c - 6

• 6c - 6

• 6c - 3

• 6c - 18

Answer explanation

You need to multiply the 2c and -6 inside parenthesis by the 3 outside to get 6c - 18

Which of the following represents the expression below simplified?

(2y - 3) + (-6y + 8)

• -8y + 11

• -4y + 5

• -4y - 5

• -8y + 5

Answer explanation

2y + -6y = -4y

-3 + 8 = 5

so -4y + 5

What is the value of s in the following equation?

3s + 6 = 24

• 6

• 18

• 10

• 3

Answer explanation

3s + 6 = 24
- 6 - 6
3s = 18
/3 /3
s = 6

Which of the following products will have a negative answer?

• (-3)*(-3)*(-4)

• (-1)*(-3)*(-3)*(-7)

• (-3)*(4)*(-2)

• (2)*(5)*(3)

Answer explanation

neg * neg = pos

pos * neg = neg

pos * pos = pos

What is the solution to the equation below?

-3x + 6 = - 15

• -7

• 7

• -3

• 3

Answer explanation

-3x + 6 = -15

- 6 -6

-3x = -21

/-3 /-3

x = 7