Help me with this step by step

C

Step-by-step explanation:

Elevation of the plane is y.

y =

The airplane starts at an elevation of 8500 feet

y = 8500

It is said that the plane loses elevation at a rate of 150 feet per minute.

y = 8500 - 150

We don't know how many minutes the plane has been losing elevation so we use m

y = 8500 - 150m

(a) the volume of the cone is 20/3 in3

hence, option a is correct.

i believe that the answer is

b. y-1=-2(x-4)

hope this !