Complete the pattern 1/27, 1/9, 1/3, 1

Acollege is planning to construct a rectangular parking lot on land bordered on one side by a highway. the plan is to use 680 feet of fencing to fence off the other three sides. what dimensions should the lot have if the enclosed area is to be a maximum?

Reflect the point (7,0) across the y-axis

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