An online retail company track total number of purchases monthly. in july 2007 there were 3840 purchases and an april 2008 there were 4200. the purchases followed a linear model of the form p=s(t)=rt+i where p purchases is in 1000's and t is months where january 2007=0

Which of the following would represent the sum of 3 consecutive integers if x is the first integer?

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?

Askateboard ramp is in the shape of a right triangle what is the height of the ramp