Homework Help: maths

Posted by Anonymous ii on Saturday, January 21, 2012 at 5:37pm.

A storage tank is in the shape of a right circular cylinder that has a diameter of 20 inches and a height of 3yards. if oil costs $2 per cubic foot, what does it cost to fill the storage tank oil?

maths - Reiny, Saturday, January 21, 2012 at 5:47pm
volume of cylinder = πr^2 h

radius = 10 inches
= 10/12 or 5/6 ft
height = 3 yards = 9 ft

vol = π(25/36)(6) = (25/6)π cubic ft.

cost = $2(25/6)π = $25π/3 or $26.18

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