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?
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a directly proportional to b^2
(a1/a2)=(b1/b2)^2-----(1)
given,a1=10,b1=3
a2=?,b2= 9
put above values in eq(1)
a2=90
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