exam Maths Puzzle Numerical Ability

How would I simplify?

(6a^2/7b^2)^-2

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exam Other Question

Use the logarithm properties to present the expression log(x + 9) - log x as the logarithm of a single quantity Lynn invests 10,000$. in one account, he earns 6% interest, in the other, he earns 4.5%. How much did he invest in each account if he makes 570$ in one year?

PLEASE HELP!!!!!!!!!!!