71. If 1/n+1/2n+1/3n=k, what is the value of nk? Express your answer as a common fraction.

75. If the difference in the degree measure of an interior and exterior angle of a regular polygon

is 100ยบ, how many sides does the polygon have?

8 sides 140 + 40 = 180 (and they have 100 difference) 40 is exterior angle and 360 / 40 is 8

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