Answer:
The answer to this question can be described as follows:
Explanation:
A)
The goal is to increase the area and therefore
Target formula: A = xy
The limited amount of money, which we have for the fence, and it only has $400
The equation of constraints: 400=(fence costs parallel to roads) +( 3 other side cost)

B)
To solve y we use the limiting equation:

Now, put the value in the y and maximise as much as possible into our goal equation:
A function for:

C)
Select the critical value the A(x):

We now need, with the second derivative, to ensure that this value is maximum:

not only is there a relative maximum at x = 10, but we can conclude that the
maximum occurs as
for all x. We also need y:
