If i understood the question right, you're trying to find the value when h = -2. If that's true so here is how it's done:

Jack was planting a tree. He was to dig a hole that was 3 feet deep for every 5 feet of tree height. How deep should he dig the hole for a tree that is 17feet high.
Calculations
Cross multiplication

=
5x = 2 x 13
Divide by 5 to isolate x

=
x = 10.2
Answer = 10.2
Answer: The answer is not to have drugs
Step-by-step explanation:
The answer is $2.00 hope this helps