exam Maths Puzzle Numerical Ability

I need to find the volume of a right circular cylinder the height is 5 inches and radius is 2 inches.

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Please help:
For f(x) = 5 - 3x and g(x) = x2 - 1, find f(g(x)) and g(f(x)).

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please help me with this question :)

-10+4(3p+10)=18