Question

I've already answered question A but I'm struggling with question B. I am in 7th grade but I do 8th grade math. I need some help.​

Answer 1

Okay so we plug in 66 inches into the equation as h for height. Then we get
66=3t+12
Subtract 12
We get 66-12=54
54=3t
Divide by 3
T=18
It will take 18 months