exam Maths Puzzle Numerical Ability

if f(x)= x squared + 5x and g(x)= 2x-x squared, find f(a+1)-g(a+1)

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HI
please help me with this

A parking meter accepts only Quarters and dollars. If there are 31 coins and a value of $ 20.50 how many quarters and dollars are there.

thanks for any help coming my way I have no clue as to what I am doing. Please help. The picture that is with this is of a rectangular cubed box and on one of the sides it has this next to it: x + 2 .
Geometry.