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decoreyjpaipxv
10.06.2021 •
Mathematics
Need to make a rectangular pen for pigs that will enclose a total area of 169 square feet. What is the least amount of fencing that will be needed?
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Ответ:
The least amount of fencing needed for the rectangular pen is 72.19 feet.
Step-by-step explanation:
The area and perimeter equations of the pen are, respectively:
Where:
Let suppose that total area is known and perimeter must be minimum, then we have a system of two equations with two variables, which is solvable:
From (2):
(2) in (1):
And the first and second derivatives of the expression are, respectively:
Then, we perform the First and Second Derivative Test to the function:
First Derivative Test
Given that dimensions of the rectangular pen must positive nonzero variables:
Second Derivative Test
In a nutshell, the critical value for the width of the pen leads to a minimum perimeter.
If we know that
, then the value of the perimeter of the rectangular pen is:
By (2):
Lastly, by (1):
The least amount of fencing needed for the rectangular pen is 72.19 feet.
Ответ:
Step-by-step explanation:
To evaluate this expression, let's first plug in the value of m into the expression.
1 + (- ) - (- )
To make this expression easier to solve, let's convert every value into a fraction with a a common denominator.
6/6 + (-4/6) - (-27/6)
Now we can solve.
When you add a negative number, it's the same thing as subtracting, so:
6/6 + (-4/6) can be written as: 6/6 -4/6, which is equal to 2/6
Now our expression is: 2/6 - (-27/6)
When you subtract a negative number, it's the same thing as adding that number, so:
2/6 - (-27/6) can be written as: 2/6 + 27/6
2/6 + 27/6 = 29/6
Since 29/6 is already in it's most simplified form, 29/6 is your answer.