Apet store had 25 boxes of dog food and 36 boxes of cat food. each box contained 12 cans. how much dog and cat food did the store have altogether? which two operations could be used to solve this problem

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.