Can somebody answer these for me

6.3x+14 and 1.5x-6 answer in simplified form

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.

Y=21.95x+10 y=22.45x solve by substitution