exam Maths Puzzle Numerical Ability

Simplify:

12/(x+h+15) minus 12/(x+15) all divided by h

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exam Other Question

At a distance of 10 meters from a rock band the intensity of sound is approximately 0.1 watt per square meter. Find the intensity in decibels. Solve using the quadratic formula please:

x^2-3x-23=5

Please provide step by step instructions to help me understand.
Thanks!
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