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Mathematics 18 Online
OpenStudy (anonymous):

Check my answer! If f(x) varies directly with x, and f(x) = 10 when x = 4, write the direct linear variation equation. A. f(x) = 10x B. f(x) = 4x C. f(x) = 2.5x D. f(x) = 0.4x My answer: C.

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