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15 February, 00:48

3.

"a varies directly with b". If a = 4 when b = 21, find a when b-7.

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Answers (1)
  1. 15 February, 03:02
    0
    Step-by-step explanation:

    A (promotional sign) b

    A=kb

    4=21k

    K=0. 1904

    A=0. 2b

    A=0. 2*7

    A=1. 4
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