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Use the data on the dot plot to answer the question.how many people read for more than three hours last week? i'm on a unit test review

Hi, can anyone show me how to do this problem? 100 points for this. in advance

Which of the following is a solution of z^6 = 64i? 2(cos105° + isin105°) 2(cos120° + isin120°) 2(cos135° + isin135°) 8(cos15° + isin15°)