Math

A farmer has 450m of fencing to enclose a rectangular area and divide it into two sections.
a) Write an equation to express the total area enclosed as a function of the width.
b) Determine the doman and range of this area function.
c) Determine the dimensions that give the maximum area.

Can someone explain how to do this please? I got part a already, and the equation I got is:

A(w)= ( 450-3w
______

2 ) w

I don't understand part b and c.

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