math

A varies BC, when b=4,and c=9,a=6
a.find the formulea connecting A,B and C.
b.find A whenn B=3 and C=10
c.find C, if A=20 and B=15

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asked by sandra
  1. Could you clarify what you mean by "A varies BC" please? I feel there's more to this question than reproduced here.

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    posted by David Q
  2. did you mean
    A vavies with BC or A varies directly with BC, if so, then

    a. A = kBC

    so, 6 = k(4)(9)
    k = 6
    then A = 6BC

    b. A = 6(3)(10) = 180

    c. 20 = (6)(15)C
    C = ......

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    posted by Reiny

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