Which one has a smoother transition?

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.

Solve 17= -13 - 8x and show your work.

Which fraction represents the ratio 35 : 42 in simplest form