Me question 1 is part 1 and question 2 is part 2

Which equation can be solved to find x the measure of jk in the apex

Sole the equation 6n + 9 = -3n - 21 - 6 for n

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $36.98. find the probability that a randomly selected bill will have an amount greater than $173, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?