Approximately what are the zeros of this parabola?

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?

Ihave trouble finding the nth term of a linear sequence

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m