Find the volume of the rectangular prism. v = ? cm3

Which is an equation for the nth terms of the sequence 12,15,18,21

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?

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?