document.write( "Question 139570: A hot-water heater is in the shape of a circular cylinder. It has a height of 3 feet 9 inches and a diameter of 16 inches. How many gallons of water will the tank hold? (1 cubic foot-7.5 gallons. Round to the nearest tenth, if necessary. \n" ); document.write( "
Algebra.Com's Answer #101850 by ankor@dixie-net.com(22740)\"\" \"About 
You can put this solution on YOUR website!
A hot-water heater is in the shape of a circular cylinder. It has a height of 3 feet 9 inches and a diameter of 16 inches. How many gallons of water will the tank hold? (1 cubic foot-7.5 gallons. Round to the nearest tenth, if necessary.
\n" ); document.write( ":
\n" ); document.write( "The volume of a cylinder: V = pi*r^2*h
\n" ); document.write( ":
\n" ); document.write( "radius = 16/2 = 8\"
\n" ); document.write( ":
\n" ); document.write( "Convert 3' 9\" to inches: (12*3) + 9 = 45\"
\n" ); document.write( ":
\n" ); document.write( "V = pi*8^2*45
\n" ); document.write( "V = pi*64*45
\n" ); document.write( "V = 9047.8 cubic inches
\n" ); document.write( ":
\n" ); document.write( "Convert to cubic ft
\n" ); document.write( "\"9047.8%2F1728\" = 5.236 cu ft
\n" ); document.write( ":
\n" ); document.write( "5.236 * 7.5 = 39.3 gal. \n" ); document.write( "
\n" );