exam Maths Puzzle Numerical Ability

(9x+3)/(x^2-9) - (5)/(x-3) Any help with this problem would be appreciated.
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exam Other Question

Write your result in scientific notation. (2x10^5)(4x10^4) This is what I have done so far: (2x2^5*5^5)(4x2^4*5^5). I know the answer is suppose to be 8x10^9, I can not figure out how to show the rest.

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10. Mona earns three times as much as an actuary as she does as a writer. Her total income is $40,000 more than that of her brother. Heearns 1/2 as much as Mona does as