Question

a varies directly as b ^3 . When a = 2 , b=1, find the value of a when b =3.
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Answer 1

Answer:

54

Step-by-step explanation:

Since a is directly proportional to b, we can say a=k.(b^3)

When b=1, a=2 which means we can find k

Lets put values in the equation, a=k.(b^3) => 2=k.(1^3), so k =2

Now when b=3, then a = 2x(3^3) = 54