Answer:
1250 3 x28
Step-by-step explanation:
5000
4
x8
3
x20
Check the picture below.
now, the "x" is a constant, the rocket is going up, so "y" is changing and so is the angle, but "x" is always just 15 feet from the observer. That matters because the derivative of a constant is zero.
now, those are the values when the rocket is 30 feet up above.

7+8= 15 so the second answer
So the answer is (2c – 3) (2c – 3) or (2c – 3)^2