3 years ago

Value of a varies directly as the square of the value of b, and b=3 when a=10. What is a when b=9?

1 answer:

3 0

General equation: a = k*b^2

Specifically: 10 = k*(3)^2 = 9 k

Solving for k: k = 10/9

Then a = (10/9)b^2. If b = 9, then a = (10/9)(9)^2 = 90 (answer)

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