Provide the input and output of the function f(x)

Can someone me and do the problem plz so i can understand it more better

Which expression converts 45 degree to radians

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.