exam Maths Puzzle Numerical Ability

A disc jockey must play 18 commercial spots during 1 hour of a radio show. Each commercial is either 30 seconds or 60 seconds long. If the total commercial time during 1 hour is 15

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Factor Completely. x^2 - 2x +1

I am having trouble solving this problem and need some help. Thanks is 14 the solution in of equation x+11=39