book Maths Puzzle Numerical Ability

i do not understand polynomials AT ALL so any help would greatly be appreciated
(2x squared +3x - 5)+ (7x squared -x+7)=
i tried it and this is what i got for the answer
9xsquar

Read Solution (Total 0)

book Other Question

A sum of money amounting to $5.15 consists of 10 cents and 25 cents. If there are 32 coins in all, how many 25 cents are there? Please help me solve this fraction: 8(-3)/[(2+3)^3(2)]

I know you are supposed to do the exponent first but I can not remember if you add 2+3 then raise it to 3 or raise each f