What is 4x- (9-3x)=8x-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?

What 8/12+8/11 in another way than and improper fraction

1/2+1/6-3/4 simplify the given expression leaving the answer in improper fraction form.