Solve for x, y, and z 2x+y-4z=5,\ 3x-2y+3z=9,\ z=x+y

()1. how do you find range? 2.the following set of data is to be organized into a histogram. if there are to be five intervals on the graph, what should the length of each interval be? 30, 34, 23, 21, 27, 25, 29, 29, 25, 23, 32, 31

Sasha drank 8 bottles of water everyday for a week. how many bottles of water did she drink in total?

The vertex of this parabola is at (-2,-3). when the x-value is -1, the y-value is -5. what is the coefficient of the squared expression in the parabola's equation?