A developer wants to enclose a rectangular grassy lot that borders a city street for parking. If the developer has 350 feet of fencing and does not fence the side along the street, what is the largest area that can be enclosed?

you can see kind of the setup

here. draw a picture. pick variables for the length and width. make an equation for the three sides (using your variables) and the total length part. then use the variables to do an area equation for the rectnagle. solve the first eqn for one of the variables. substitute into the second equation. then find the max/min point kind of like they show

here. if you get stuck please write back showing your variables etc etc.