exam Maths Puzzle Numerical Ability

Simplify the complex fraction and write the term in the lowest terms:
a over a^2-b^2 divided by 1 over a+b plus 1 over a-b

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exam Other Question

Find the foci of a hyperbola with the equation 9y2 - 72y - 16x2 - 64x - 64 = 0 A person invested $10,000. The greater part is invested at 6% and the remainder at 5%. The annual income from the greater part is $160.00 more thatn the annul income from the smaller part. What is the smaller part of the investment?