Oodles#3543 Anyone wanna talk on discord?

Answer asap! urgent! will give brainliest!

Lines a and b are perpendicular. if the slope of line a is 3, what is the slope of line b?

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?