exam Maths Puzzle Numerical Ability

if f(x)=2x to the second powerand g(x)=x to the second power - 3 find (f g)(x)

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exam Other Question

I dont understand how to start the problem or finish it either. mark and melinda collect baseball caps. mark has 7 more thn melinda. together, they have 115 caps. how many baseball caps does each of them have?