book Maths Puzzle Numerical Ability

Identify the binomial expansion of (x-y)^3.

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I need some help on this problem.
Jerry earned $18,500 one year and then received a 10.5% raise. What is his new yearly salary?
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Lyn Please help me with this question, and if possible how to do it!

Give that angle A is a complement of angle B and m angleB=81 degrees, find m angleD.