Can y’all help me on my last one

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 the given system of equations. 2y= -x+9 , 3x-6= -15

What number line represents the solution set for the inequality -1/2 greater than or equal to 4