exam Maths Puzzle Numerical Ability

if n=9 and q=10 what would the answer be to nq

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exam Other Question

Find all positive values for k for which the following can be factored.

x� +x - k $.10 per kilowatt-hour. Power consumption of my stereo is .35 kilowatts. I only want to spend $6 for the month on stereo use. How many hours can I play my stereo.