What is the solution to the equation?

r/7.1 = 4.2

Abank gives 6.5% interest per year. what is the growth factor b in this situation?

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

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?