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

if a = 5b
then 3/5(a) = ?

the answer is 3b but I don't understand the rationale behind it, please explain!? Please help me help me with this pattern. imaginary 1=, imaginary 2=, imaginary 3=, imaginary 4=