Line $m$ has the equation $y = 3x + 5$. Line $n$ has the equation $y = kx - 7$. Lines $m$ and $n$ intersect at the point $(-4, -7)$. What is the value of $k$?

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.