book Maths Puzzle Numerical Ability

i need to classify the polynomial function by number of terms and by degree


n=5m^2-3m^3

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book Other Question

Suppose you add a polynomail of degree m from a polynomial of degree n where m>n. The results is a polynomial of degree ___. if line a has a slope of -3/8 then what is the slope of a line perpendicular to a?
i got 8/3
is that right? thanks!