exam Maths Puzzle Numerical Ability

3+ sqrt (x^2-8x)=0

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exam Other Question

Find all the numbers for which the rational expression is undefined.

7/x^2+81 (7 over x squared + 81) Lynn Ogen invested some money at 9% interest and $100 less than that at 7% interest. Her total annual interest was $73. How much did she invest at 7% interest?