-6/7 x (-5/4)

Pls put it as a fraction :)

How do you answer this question? (step by step)

For what value of (y) is 3^3/3^y =1/9

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.