exam Maths Puzzle Numerical Ability

Factor completely. 12x^3 – 3xy^2 I got 3x(4x – y)(x + y) Is this correct

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Can you please help me figure this one out.

If I invested $10,000, part at 15% and part at 14%.
If the total interest at the end of the year is $1430, how much did I invest at 15%?

Thanks for your help Can someone help me subtract this rational expression??? PLEASE!!

5a-12 over a^2-8a+15 - 3a-2 over a^2-8a+15

so far I have 5a-12-3a+2 over a^2-8a+15......now I am stuck! Help!!

Thank you so much!
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