twice the sum of a number and 8 is equal to 3 times the difference of the number and 7 find the number ​

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 similarity ratio of a cube with volume 729m^3 to a cube with volume 3375 m^3

An elevator travels 310 feet in 10 seconds. at that speed, how far can't his elevator travel in 12 seconds?