Need help on Absolute value equations

Which of the following tables represents exponential functions?

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?

Find the root(s) of f (x) = (x- 6)2(x + 2)2.