I fell asleep in class can someone please help me?

I can answer only the first two questions, the third one is not complete.

Here we will work with the volume of cylinders.

The volume of a cylinder of radius R and height H is:

V = pi*R^2*H

where pi = 3.14

first question:

We want to find the volume of a cylinder of radius R = 8 in, and height  H = 16 in

Then the volume of this cylinder is:

V = 3.14*(8in)^2*16 in = 3,216.36 in^3

Second question:

Now we have a height of 4.25 in, and a diameter of 3.25 inches.

Remember that the radius is half of the diameter:

R = 3.25 in/2 = 1.625 in

Then we have:

R = 1.625 in

H = 4.25 in

Then the volume of this cylinder is:

V = 3.14*(1.625)^2*4.25 in = 35.24 in^3

i think the answer is b