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Direct square variation if z varies directly as the square of r and z is 24 when are is 4 what is r when z is 121.5?
Wiki User
∙ 13y ago
z varies directly as the square of r
So z = cr2 where c is the constant of variation.
z = 24 when r = 4 ie 24 = c*42 so that c = 24/42 = 1.5
When z = 121.5,
121.5 = 1.5*r2 so that r2 = 121.5/1.5 = 81 so that r = -9 or +9
Wiki User
∙ 13y ago
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