Bill and Bob cycle in opposite directions. Bill cycles at 12 km/h and Bob cycles at 13 km/h. Bill starts 2 hours before Bob does.
From the time Bob begins cycling, how long does it take for
them to be 99 km away from each other?
h

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.