find the lengths of lien segments AC & CB

1-for what value of x is line a parallel to line b 2-for what value of x is line a parallel to line b

Which of the following expressions is equal to 2x^2+8

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?