exam Maths Puzzle Numerical Ability

Please help with this problem.

Simplify--

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

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exam Other Question

FACTOR EACH EXPRESSION:

40- 5T CUBED 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