It takes 40 minutes for 8 people to paint 4 walls.
how many minutes does it take 10 people to paint 7 walls?

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?

James wants to promote his band on the internet. site a offers website hosting for $4.95 per month with a $49.95 startup fee. site b offers website hosting for $9.95 per month with no startup fee. for how many months would james need to keep the website for site a to be a better choice than site b?

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?