Can you solve this using matrices by row operations 4x+y-2z=-6 2x-3y+3z=9 x-2y=0

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?

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

How do i solve uniform motion problems?