book Maths Puzzle Numerical Ability

During the summer Tom mows lawns in his neighborhood. When he works he charges a flat fee of $27 plus a fee of $6 for each 100 square feet he mows. Yesterday he mowed the lawn of

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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
Solve the following system by using the Gauss-Jordan Method:

6 3 -1 : 5
-5 -6 7 : -6
4 -4 9 : 2