Fine the following when a=-2, b=4, c=7 7b-12 over 2ac

()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

You are cycling around europe with friends. a cycling festival is starting soon in barcelona. it will take 4.5 hours to cycle there. how many minutes in total is this?

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2