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27 March, 14:42

If y = 7.2 when x = 10, what is the value of x when y = 20? (y varies inversely as the square of x.) A. 14.4 B. 10 C. 6 D. 20

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  1. 27 March, 14:54
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    6

    Step-by-step explanation:

    Y is directly proportional to 1/x2

    Y = k/x2

    Where k is the proportionality constant

    y1 * (x1) 2 = y2 * (x2) 2

    7.2 * (10) 2 = 20 * (x2) 2

    x2 = sqrt (36)

    X = 6
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