A20-a18=a1+19d-a1-17d=2d =281-97
so
d=92
Vertical line are represented by x = a number....that number being the x value in ur set of points
so ur equation is : x = -7
First. we use the Pythagorean theorem:

Add the numbers in

start simplifying


So, the leg has a length of 40 mm.
Answer:
you have to do 52 divided by cos of 38 to get the answer of 65.99ft