Use a bar model to find the unknown value: 3/6 = ? /7

Find the missing dimension extra points

How can you find the mean absolute deviation (mad) for this set of data?

In order for the function to be linear, what must m be and why? m = 22 because the rate of change is 1. m = 20 because the rate of change is 3. m = 22 because the rate of change is -1. m = 20 because the rate of change is -3.