book Maths Puzzle Numerical Ability

Hii i need help on this problem. And the question says write each expression as a simple fraction... -5 to the -3 power

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Please help me solve this equation. I tried to solve these problems but I don't know the first step.
{{{7-1/9 k +32}}}

Thank You for your time. It is greatly appreciate Please help me with this word problem.

1. A house was bought for $50,000 and was sold 15 years later for $95,000. Find the effective yield.

Thank you very much