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I'll help with one.

okay it says to find the volume of the solid

Do you know the formula for the volume of a cone?

not of the top of my head

sorry, my computer just froze up
it is (1/3)*Pi*r^2*h

are 10 and 18 the heights, or are they the length of the lines they are next to?

yes so \[1/3\times \pi \times 5^{2}\times10\]

only if 10 is the height

\[1/3\times \pi \times 5^{2}\times18\]

10 is the height of the top cone and 18 is the height of the bottom cone

I doubt you would get it wrong for being off by .04

So, lets assume that 18 and 10 are the lengths of the lines they are next to, and not the heights.

You following so far?

yea

Notice how we have the radius and the hypotenuse of a right triangle?

ya

Well, we can use the good old Pythagorean formula to figure out the missing side.

Sqrt[18^2-5^2]
and
Sqrt[10^2-5^2]
are our two heights

(1/3)Pi*( Sqrt[18^2-5^2] )^2
+
(1/3)Pi*( Sqrt[10^2-5^2] )^2

^ That should give you the correct answer, which comes out to be...

idk i dont have a calculator

oops, I did that formula wrong :/

(1/3)Pi*( Sqrt[18^2-5^2] )^2 + (1/3)Pi*( Sqrt[10^2-5^2] )^2
isn't right, but you get the idea

I left out the radius

You get it though, right?

kinda

(1/3)*Pi*r^2*h

Well, I'm sleepy, so I'm off to bed. I have to wake up and do calculus
D: