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6 January, 20:07

If f (x) varies directly with x and f (x) = 2 when x = 10, then what is the value of f (x) when x = 40?

a. 8

b. 45

c. 200

d. 320

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Answers (1)
  1. 6 January, 22:17
    0
    This is simple multiplication

    do 2*4 and 10*4

    so you get f (x) = 8 and x=40

    if you wanna do it by doing division do

    2=10

    f (x) = 40

    cross multiply then divide

    so do 2*40 to get 80

    then do 80/10 to get 8
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