exam Maths Puzzle Numerical Ability

I really would like some help on the rational addition expression...Thank you for all your help!!

n - 2 n^2 + 5n + 10
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n + 4 n + 4

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exam Other Question

x^+y^+z^-xy-yz-zx=0 then find the value of (x+y)/z I have been working on this problem for about an hour. I am ready to toss it out the window!
1) Let f(x) compute the time in hours to travel x miles at 58 miles per hour.
2)What does f-1(x) compute?

Thanks so much.