Ginger sent 18 text messages yesterday jerry sent 4 more than twice as many messages as ginger sent. kyle sent 15 fewer messages than jerry. how many text messages did jerry and kyle send?

How do you find principle and simple interest

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?

Find the maximum value of p= 4x + 5y subject to the following constraints :