At Marie's Book and Music Store, 7/20 of the sales come from books, 6/20 of the sales come from music and 3/20 of the sales
come from video games.
What fraction represents the portion of sales from books, music,
and video games?

What is the base of 1/9 to the power of 2

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?

Name each raycalculation tip: in ray "ab", a is the endpoint of the ray.