book Maths Puzzle Numerical Ability

Let f(x)=x^2-25 and g(x)=x+5, find a)(f-g)(x) and b)(f/g)(x)

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book Other Question

In a group of quarters and nickles, there are 4 more nickles than quarters.
How many nickles and quarters are there if the coins are worth $2.30? z-12=6 how do I work this out