I have a packet of application problems and i've done most of them except for the ones i really didn't get and it's due tomorrow. please help

1) One campus of Houston Community College has plans to construct a rctangular parking lot on land bordered on one side by a highway. There are 640 ft. of fencing available to fence the other three sides. Let x represent the length of each of the two parallel sides of fencing

a) Express the lenght of the remaining side to be fenced in terms of x.

b)state the domain restrictions on x.

c)Determine a function A that represents the area of the parking lotin terms of x.

d)Find the value of x that will give the maximum area and state the dimensions of the rectangle.

Any help at all would be greatly appreciated.

2. It is difficult to "help" if you haven't done anything. Please show your work.

I'll get you started.

640 ft of fencing. Two sides are 'x'. That leaves on side that measures 640' - 2x

3. the thing is i could do it,if i had the set ups for it, i don't,i've tried.

4. The setup is the interesting part. You have studied solutions for some time. Now is the time for you to set up your own equations. It is a natural progression. You don't want to do just easy stuff for the rest of your life, do you?

Part b - domain restrictions. Pretty obviously, 0 < x < 640', since there are 2 x-sides. Oh, then 0 < 2x < 640' and 0 < x < 320'

We also know that 0 < 640' - 2x < 640, but that leads to the same conclusion as above.

You must cross this bridge, from simply solving a given equation with instructions, to following a logical pathway through a problem statement. Back when you studied "Domain" and "Parabols" and "Quadratic Equation", this was they hoped-for day - the day you get to show off what you learne din those sections.