







There are two critical points, at which we have


Answer:
39 pi cubic inches
Step-by-step explanation:
The volume of a cone is (1/3)(area of the base)(height).

Find the area of the circular base. The circumference of a circle is
, so

Now that you know the radius of the circular base, you can find its area:

The height of the cone is 13. Time to use the volume formula.

Answer:
havent got tought this yet sorry wish i can help
I know this is late and you probably got the answer but just in case its C. 5. :P