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Ihave trouble finding the nth term of a linear sequence

Two angles are complementary. the large angle is 36 more than the smaller angle. what is the measure of the large angle?

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?