At 7pm last night ,the temperature was 10 degrees fahrenheit. at 7am the next morning the temperature was negative 2. by how much did the temperature change from 7pm to 7am?

()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

What are “like terms”? why can we only add like terms?

Aclassmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. explain why this isn't true.