Benchmark 1 - big ideas math - grade 7
24. jack's mother is 44 years old. she is 4 years older than 8 times jack's age. the
equation 8a + 4 = 44 represents this situation.
how old is jack?
a. 5
b. 6
c. 9
d.13

Jack is five. so, it's A

Step-by-step explanation:

subtract 4 from both sides of the equation. You can cancel out the four on the left, and get 40 on the right (since you took four away from 44.)

Then, divide by 8 on both sides. The eight is canceled out on the left. eight goes into 40 five times, meaning a=5.

b) well because you get well