Help me on the lasttt onee

What is the length of the segment joining the points at (4,5) and (6,-2) round to the nearest tenth if necessary

Asquare parking lot has 6,400 square meters what is the length in meters

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.