2:3 how do you know your answer is correct?

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?

What is the 17th term in the arithmetic sequence in which a6 is 101 and a9 is 83

Klmn and pqrs are similar trapezoids. which side of pqrs corresponds to lm