book Maths Puzzle Numerical Ability

I cant figure out how to divide a monomial by a monomial. Im stuck on these three problems.
Numbers in < > represent exponents

(5n<5>p)<0> / (n<3>p)<2>=


3(a<2>b)4 / (3ab)

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book Other Question

which of the following is one of the two binomial factors of 6s2+40s-64 Given f(x)=4x-3 and g(x)=2x(to the power of 2)-5 find f[g(-1)] and g[f(-1)].