exam Maths Puzzle Numerical Ability

(m^3-mn^2)/(mn^2+m^2n-2m^3)

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If F(x)= 3X to the 3rd power -6X to the 2nd power - x + 7, what is the value of f(2) + f(-2)?

This question is multiple choice, it is either A. -34, B. 0, C. 2, D. 7, E. 14 a boat goes upstream 30 miles and downstream 44 miles in 10 hours.the next day it goes upstream 40 miles and downstream 55 miles in 13 hours.what is the average speed of the boat and the stream?