Please answer whats in the photo

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?

Why did the ice arena get so hot after the big game (this is math related google it to find the paper

Solve for n? [tex]z = \frac{3}{4} mn[/tex]