The sales tax in bill's state is 6%. bill bought a scion having a sales tax of $820. what was the cost of the car? round to nearest dollar.

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?

What set does not contain -3 the set of all real numbers the set of all integers the set of all whole numbers the set of all rational numbers

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25