Answer:
(35,0)
Step-by-step explanation:
Consider the diagram below, the starting point is given as A and the finish point given as C.
Using similar right-angle triangle, we have that:

Therefore to find the point where Derek stops at C, we first determine the distance |AC|
|AC|=7+28=35
The Coordinates at C where Derek stops is (35,0)
Isn’t there supposed to be a picture?
20 and -1: they add into 19 and since a negative times a positive is a negative they multiply to -20
A regular polygon has the same amount of sides and angles