Which of the following sets of numbers could be the side lengths of a right triangle? 3, 4, and 7
9, 40, and 42
8, 15, and 16
20, 21, and 29

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.