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kakasveta [241]
3 years ago
6

John wants to build a corral next to his barn. He has 300 feet of fencing to enclose three sides of his rectangular yard.

Mathematics
1 answer:
Mandarinka [93]3 years ago
3 0
Let's first define the variables:
 x = width
 300 - 2x = long
 The area will be:
 A = (x) * (300 - 2x)
 A = 300x - 2x²
 We look for the maximum area, for this, we derive:
 A '= 300 - 4x
 We match zero:
 0 = 300 - 4x
 x = 300/4 = 75
 Therefore, the width is:
 x = 75 feet
 The length is:
 300 - 2x = 300 - 2 (75) = 300-150
 150 feet
 Answer:
 Part A:
 
The maximum area will be:
 
A = (150) * (75) = 11250 square feet
 
Part B:
 
The dimensions are:
 
Length = 150 feet
 width = 75 feet
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A

   The  correct option is B

B

   t =  0.6093

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D

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