I need the answer to a square root of -45

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.

Look at the chart showing the results of a baseball player at bat. which is the probability of getting a hit?

How does the graph of y = 3x compare to the graph of y = 3-x?