document.write( "Question 187978: Gerry wants to inflate an exercise ball. The ball has a radius of 15 inches. If a pump can push 5 cubic inches of air everysecond, how many seconds will it take to inflate the ball? \n" ); document.write( "
Algebra.Com's Answer #140919 by Alan3354(69443)\"\" \"About 
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Gerry wants to inflate an exercise ball. The ball has a radius of 15 inches. If a pump can push 5 cubic inches of air everysecond, how many seconds will it take to inflate the ball?
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\n" ); document.write( "The volume of a sphere of radius r is
\n" ); document.write( "\"V+=+4%2Api%2Ar%5E3%2F3\"
\n" ); document.write( "\"V+=+4%2Api%2A3375%2F3\"
\n" ); document.write( "V = 4500*pi cubic inches
\n" ); document.write( "t = 4500pi/5 = 900*pi seconds
\n" ); document.write( "t = ~ 2827.43 seconds
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