Sunday
May 19, 2013

# Homework Help: math

Posted by Sam on Sunday, August 5, 2012 at 11:10am.

steel is \$50 per cubic foot. What is cost of cone with radius 7.5 inches and 25 inches height?

• math - MathMate, Sunday, August 5, 2012 at 12:18pm

Work out all dimensions in feet.

r=7.5 inches = 7.5/12=0.625'
h=25 inches = (25/12)'

Volume = (1/3) π r² h
and
from the price of \$50/ft², we get

Cost=volume*price
=(1/3) π r² h * 50

Round the answer to two decimal places (to the cent).

I'll leave it to you to work with the buttons of your calculator.

• math - Sam, Sunday, August 5, 2012 at 3:38pm

Thank you, it works.

• math :) - MathMate, Sunday, August 5, 2012 at 4:00pm

You're welcome!

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