Answer:
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Step-by-step explanation:
The maximum area of the pen is the highest area the pen can have
The maximum area is 16200 square yards
Let the dimension be x and y.
So, the perimeter is given as:

Because it has one additional fence, the perimeter is calculated as:

Make y the subject

The area is calculated as:

Substitute 

Expand

Differentiate

Set to 0

Rewrite as:

Divide both sides by 4

Substitute 90 for x in 


Hence, the maximum area is 16200 square yards
Read more about maximum areas at:
brainly.com/question/11906003
The common denominator is 21 so 5/7 would be 15/21 and 1/3 would be 7/21 so 5/7 is greater than 1/3
The answers are..
6. 55
7. 6
8. 39
9. 17
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