exam Maths Puzzle Numerical Ability

What is known about the # of solution to a system of m linear equations in n unkowns if "m=n", "m<n" and "m>n"?

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Please simplify this:

1/a-b + 4/b-a - 8/a+b - 11a-5b/b^2-a^2

I have no idea where to begin. Please help--Thanks. A salesman gets a comission of $2.65 on each item sold. One morning he sold 15 calculators and 19 pocket radios. Find his Commission

Hi i forgot how to solve problems like this can you show steps and answer please