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9 February, 10:40

The function f (x) varies inversely with x and f (x) = 0.2 when x = 0.4.

what is f (x) when x = 1.6

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  1. 9 February, 14:12
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    Varies inversely:

    f (x) = k/x

    There is always a constant of variation, k to solve for using the given information. when x = 0.4; f (x) = 0.2

    0.2 = k/0.4

    0.2 (0.4) = k

    0.08 = k

    final equation : f (x) = 0.08/x

    when x = 1.6

    f (x) = 0.08/1.6

    f (x) = 0.05
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