exam Maths Puzzle Numerical Ability

cannot figure this out..: let f(x)=x^3-1 and g(x)=x^2+x+1. find (f/g)(x).

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exam Other Question

Find the volume of a right circular cone where the radius of the base is 21 in. and the height is 9 in. Give the exact value.

I think the formula is V=1/3 pie r squared h. 22/2<-3+