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microwave13016
15.07.2019 •
Mathematics
What is the largest rectangular area that can be enclosed with 400 feet of fencing?
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Ответ:
2 lengths are 2x.
Then you have 400 - 2x for both widths, so the width is 200 - x.
The are if the rectangle is
y = x(200 - x)
y = 200x - x^2
y = -x^2 + 200x
Take the first derivative ans set equal to zero to find a maximum value.
y' = -2x + 200
-2x + 200 = 0
-2x = -200
x = 100
Since the side of the rectangle is 100, all sides measure 100 ft, and you have a square.
The maximum area is 100 ft * 100 ft = 10,000 ft.
Ответ:
Well she wouldn’t be able to take all books because if each weighs 3 lbs and she wants to take 20 that’s already 60lbs. So all you gotta do is find the equation for it but yeah my bad if I didn’t help but yk slide that brainliest.