Aladder that is 15 feet long is leaned against a building such that it makes a 52 angle with the level ground. what height to the nearest tenth of a foot does the ladder reach up the building

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.