Answer:
18 years
Step-by-step explanation:
let catrinas age be c
3(c/2)+3=12
3c/6=9
3c=54
c=18
8y+96
8(y+12)
First, do 8*y which is 8y
Now, 12*8=96
So, the answer is 8y+96
I believe it's 35 miles per gallon of gas