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OpenStudy (anonymous):
the function f(x) varies directly with x and f(x)=3 when x=12 what is the value of f(x) when x=40
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OpenStudy (ribhu):
f(x) = kx 3 = k * 12 k = 1/4 so f(x) = x/4 so when x = 40, f(x) = 10
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