What is the product of the sum of 8 + 5 and the difference of 8 and 5

Find the height of a square pyramid that has the volume of 32 ft.³ and a base lengthof 4 feet

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?

If the cost to mail a package is an initial $5 and $0.28 for every pound the total cost to mail a package was $11.27, how much did the package weigh?