Beth is 3 times older than her sister jill. if together their ages are 24. how old is each girl

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 are the coordinates of the point that is 1/3 of the way from a to b? a (2,-3) b (2,6)

8.74 rounded to the nearest whole number