20 points please help,, I have no idea how to do this and it's due in two hours!!

a. 7.5

b. 5

c. 2.5

sorry if it is in correct

30 divided by 4 = 7.5

10 divided by 2 = 5

7.5-5=2.5

the answer for this question is 38

80π/3 or about 83.775

step-by-step explanation:

since a cone is 1/3 of a cylinder, we need to find the base's area. since area = πr^2, we get 16π. then, multiplying this by 5, we get 80π. dividing by 3, since the cone's volume is 1/3 of that of a cylinder's, we get 80π/3.

hope this !