Answer:
C. 40 ft
Explanation:
First you need to set up the abc
a²+b²=C²
plug in the numbers
36²+18²= C²
you need to square both of the number than add them together
1296 + 324 = 1620
Than you need to square root the answer you just got
√1620
Which equals
40.24
But then round it to the nearest foot
So just 40