Hello!

I am trying to figure out this problem

A field is to be marked off in the shape of a rectangle of area 144 square feet.

a. Write an expression for the perimeter, P, as a function of the length x

for this, so far i know that the perimeter is 2l + 2w so how would i set this up?

b. Use a calculator to approximate the dimensions for which the perimeter is a minimum ( I don't understand what this means)

thanks for helping! ;D