Hi i need help with these pre-calculus math problems.

1) (section Quadratic functions)-

A rectangular playground is to be fenced off and divided in

two by another fence parallel to one side of the playground.

Four hundred feet of fencing is used. Find the dimensions of

the playground that maximize the total enclosed area. What

is the maximum area?

2) ( Section Polynomials function and their graphs)-

f(x) = (x + 3)(x + 1)^3(x + 4)

3)( section Polynomial and rational function)-

f(x) = x - 4

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x^2 - x - 6