Someone answer all these questions i will give 100 points and brainiest

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?

Solve - pv + 40 < 65 for v solve 7w - 3r = 15 for r

Mustafa contributes 11% of his $67,200 annual salary to his 401k plan. what is his pretax income