If the discriminating of a quadratic equation is equal to -8, which statement describes the roots?
a. there are two complex roots
b. there are two real roots
c. there is one real root
d. there is one complex root

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?