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sveta [45]
3 years ago
8

The perimeter of a rectangle is 48 inches off the length is twice the width what is the length of the rectangle

Mathematics
1 answer:
sammy [17]3 years ago
7 0

Answer:

Length: 16

Width: 8

Step-by-step explanation:

8 + 8 + 16 + 16 = 48

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The number:

5.634\times10^2

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9/10 times a number plus 6 is 51
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Use Lagrange multipliers to find the volume of the largest rectangular box in the first octant with three faces in the coordinat
dimaraw [331]

I assume the given plane has equation

<em>x</em> + 3<em>y</em> + 4<em>z</em> = <em>d</em>

for some constant <em>d</em> ≠ 0.

You want to maximize the function <em>V(x, y, z)</em> = <em>xyz</em> subject to the above constraint. The Lagrangian would be

<em>L(x, y, z, λ)</em> = <em>xyz</em> - <em>λ</em> (<em>x</em> + 3<em>y</em> + 4<em>z</em> - <em>d</em>)

Find its critical points:

∂<em>L</em>/∂<em>x</em> = <em>yz</em> - <em>λ</em> = 0

∂<em>L</em>/∂<em>y</em> = <em>xz</em> - 3<em>λ</em> = 0

∂<em>L</em>/∂<em>z</em> = <em>xy</em> - 4<em>λ</em> = 0

∂<em>L</em>/∂<em>λ</em> = <em>x</em> + 3<em>y</em> + 4<em>z</em> - <em>d</em> = 0

The first three equations tell you that <em>λ</em> = <em>yz</em> = <em>xz</em>/3 = <em>xy</em>/4. Then, for instance,

<em>yz</em> = <em>xz</em>/3   →   3<em>yz</em> - <em>xz</em> = <em>z</em> (3<em>y</em> - <em>x</em>) = 0   →   <em>z</em> = 0   <u>or</u>   3<em>y</em> - <em>x</em> = 0

If <em>z</em> = 0, we get zero volume which is not useful. So 3<em>y</em> = <em>x</em>. Similarly, you would find <em>x</em> = 4<em>z</em> and 3<em>y</em> = 4<em>z</em>, so a critical point occurs when <em>x</em> = 3<em>y</em> = 4<em>z</em>.

In the fourth equation, we get upon substituting

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Then the largest volume of this box would be

<em>V(d</em>/3, <em>d</em>/9, <em>d</em>/12<em>)</em> = <em>d</em> ³ / 324

6 0
3 years ago
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