Answer:
5feet per year
Step-by-step explanation:
We need to find the distance it grew in that 7 1/2 years:
63 - 25 1/2 = 37 1/2
Now to find the average yearly growth we can divide this by 7 1/2:
37.5 ÷ 7.5 = 5
So the yearly rate of growth of the tree is 5f/y