What is the value of X

Define multiplicative inverse. give an example of a number and its multiplicative inverse.

If t17 = 3 (t5) in an arithmetic progression, find t1 in terms of d.

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.