Miguel has two same size rectangles divivded into the same number of equal parts. one rectangle has 3/4 of the parts shaded, and the other has 5/8 of the parts shaded. into how many parts could each rectangle be divided?

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.