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Mathematics 17 Online
OpenStudy (anonymous):

HELP

OpenStudy (anonymous):

Directrix (directrix):

@GiGIgo3 If you have the formula for the volume of a cylinder handy, we'll knock out this problem.

OpenStudy (anonymous):

V=Bh or V=πr2h

OpenStudy (anonymous):

@Directrix is it C?

Directrix (directrix):

Let me think. Just a second.

OpenStudy (anonymous):

radis^2 = 49 46 * 18 = 882 i left pie alone

Directrix (directrix):

882 pi is what I got using V = pi*r^2*h

OpenStudy (anonymous):

im right?

Directrix (directrix):

Yes, you are.

OpenStudy (anonymous):

What is the volume of a cube with a side length of 11 inches?

OpenStudy (anonymous):

1331?

Directrix (directrix):

Volume = 11 * 11 * 11 What does that equal?

OpenStudy (anonymous):

1331

OpenStudy (anonymous):

A cone has a base radius of 2 millimeters and a height of 24 millimeters. What is the volume of the cone?

Directrix (directrix):

You are right again on the cube.

OpenStudy (anonymous):

i have to use V = pi*r^2*h

OpenStudy (anonymous):

96pi

Directrix (directrix):

I thought that the formula for the cone volume had a (1/3) in it. We need to look it up.

OpenStudy (anonymous):

am i right?

Directrix (directrix):

I don't know. I thought you were going to look up the cone formula. V = pi*r^2*h is for a cylinder. The current problem is about a cone.

OpenStudy (anonymous):

a rectangular pyramid. has 1/3 in the formula

OpenStudy (anonymous):

CRAP i thought that said cylinder, i have bad eyes, i 'm tying to work it out now

OpenStudy (anonymous):

OpenStudy (anonymous):

i think its B.

Directrix (directrix):

lol -> I'm looking everywhere to see what number b is.

OpenStudy (anonymous):

96 *.3333 is 31.9968 31.9968 rounded is 32

OpenStudy (anonymous):

im right (hopefully)?

Directrix (directrix):

V = (1/3) pi (2)^2 (24) V = 32 pi if I did this right. I don't know where you got the decimals or where the pi went.

OpenStudy (anonymous):

B. is 32

OpenStudy (anonymous):

lol sorry

Directrix (directrix):

Look at it this way. You got 96 pi with the same variables except the 1/3. So, the answer should be 1/3 of 96 pi which is 32 pi. 32 pi is NOT the same as 32. So, I don't know.

Directrix (directrix):

Right, 32 pi. Don't disregard those pi symbols. 32 is 32 but 32 pi = 100.530964915 ish. A tremendous difference.

OpenStudy (anonymous):

OpenStudy (anonymous):

i ment to mark A., Not C.

OpenStudy (anonymous):

please check it @Directrix

Directrix (directrix):

Hold on while I check. If you post another one of these, please start in a new thread. I'm lost in the maze here. :)

OpenStudy (anonymous):

Directrix (directrix):

@GiGIgo3 On the cone, is this how you set it up: (1/3)*pi*144*8 ? I did not get 3260.

OpenStudy (anonymous):

please move to the other sessuion, i menat A.

Directrix (directrix):

@GiGlgo3 I agree with the new cone answer.

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