If y varies directly as the square root of x and y = 3 when x = 16. Calculate y when x = 64
y ∝ √x y = K√x K = y/√x = 3/√16 = 3/4 y = 3/4√x = 3/4√64 when x = 64 = 3/4 x 8/1 = 6
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