Ok so i have a few questions.
When graphing y>x^2 you can only use quadrant one right?
Also i have a word problem that goes like this-Suppose you have 80 ft of fence to enclose a rectangular garden.
The function A = 40x - x2 gives you the area of the garden in square feet
where x is the width in feet. and then it has two parts... a. What width gives you the maximum gardening area? and b. What is the maximum area? Please help because I have no idea what to do. Thanks :)

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unless the problem restricts it; you can use any quadrant that is available to use

2l+2w=80 thats your perimeter right?

and Area = x*y correct?

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