Step-by-step explanation:
m=4/3
b=(0,-3)
graph the point(0,-3)then go 4 times up then 3 times to the right as in positive.
The answer is the morning temperature was 5 degrees above the afternoon temp.
Volume (V) of a cylinder is the area of circular base (pi×r^2) times it's length/height (h):

h = 20.5 ft
diameter (d) = 1 1/5 × h, 1 1/5 = 6/5 = 1.20
d = 1.20 × 20.5 = 24.6 ft
radius (r) = 1/2 d = 24.6/2 = 12.3 ft