NEED HELp PLZ? Which of the following matrices could be used to solve the system of equations?

3x+2y+z=−5
4x=4
2x+2y+2z=10

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?

Which function has the domain x> -11?

Typically a point in a three dimensional cartesian coordinate system is represented by which of the following answers in the picture !