Ignition 12.5

k + k + k + k + k =

• 3k
• 4k
• 5k
• 6k

r + r + r + 12 + 7 =

• r + 19
• 3r - 5
• 3r + 19
• 2r + 5

7s - 2s + 10=

• 15s
• 5s + 10
• 19s
• 9s + 10

19p - 6p + p=

• p
• 13p
• 26p
• 14p

Simplify by combining like terms:
5a + 2b - 3a + 4

• 8a + 2b + 4
• 2a + 2b + 4
• 8ab
• 4ab + 4

4c x 3d

• 12cd

• 7cd

• cd

• none of the above

Answer explanation

To multiply 4c by 3d, multiply the numbers (4 * 3 = 12) and combine the variables (c * d = cd), resulting in 12cd.

• 6y

• 5x

Answer explanation

To simplify the expression, multiply the coefficients (6 and 5) to get 30, and multiply the variables (x and x) to get x^2, then multiply the remaining variable y to get 30x^2y.

• 3m

• 6m

• 9m

• 15m

Answer explanation

To simplify the expression, divide 18m by 3 to get 6m. Therefore, the correct answer is 6m.

• 4m

• 2m

• 24m

• 40m

Answer explanation

To divide 32m by 8, we simply divide the numbers and keep the variable m. 32 ÷ 8 = 4, so the answer is 4m.

• 2s

• 4s

• 18s

• 13s