9. The value of a guitar has been found to be —80y + 800, where y is the number of years since it was released.
a. By how much is the value of the guitar decreasing per
year?
b. How much was the initial value of the comic?

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 you had $1,900,000, how many days would it take you to spend all if you spent $1 a second. (there are 86,400 seconds in a day)

Which of the following is the result of expanding the series