The nth term of a sequence is 2n -1. The nth term of a different sequence is 3n +1. Work out the three numbers that are in both sequences and between 20 and 40. Write the three numbers on a single line. Can some one help me

Fanny mendelssohn manages all the magazines and paperback books at a local grocery store. she prices many paperbacks to sell at $7.99. the cost to the store is $5.29. what is the markup rate on a paperback book, based on its cost?

Me max recorded the heights of 500 male humans. he found that the heights were normally distributed around a mean of 177 centimeters. which statements about max’s data must be true? a) the median of max’s data is 250 b) more than half of the data points max recorded were 177 centimeters. c) a data point chosen at random is as likely to be above the mean as it is to be below the mean. d) every height within three standard deviations of the mean is equally likely to be chosen if a data point is selected at random.

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.