On which day did Andrea spend the most on her card? Explain

Write the system of equations represented by the matrix. 0 1 2 4 -2 3 6 9 1 0 1 3

()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

Which equation matches the graph shown ?