Posted by **sandra** on Monday, September 1, 2008 at 5:19pm.

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

- math -
**David Q**, Monday, September 1, 2008 at 5:48pm
Could you clarify what you mean by "A varies BC" please? I feel there's more to this question than reproduced here.

- math -
**Reiny**, Monday, September 1, 2008 at 6:07pm
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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