Does matthew meet both of his goals by selling 99 laptops and 66 smartphones?

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?

Is the square root of 4 plus the square root of 16 rational?

Christina can paint 420 square feet in 105 minutes. which unit rate describes the scenario?