exam Maths Puzzle Numerical Ability

Please help me to solve these questions:
1. given f(x) =.5x(half x)and g(x)=x-2, calculate
(a)g(-2)
(b)fg(4)
(c)f-1(4)

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5b to the 3rd power -8b + 2b to the 2nd power and
3b to the second power - 7b to the 3rd power + 5b square root of p + square root of p+3=3