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3 years ago

-8-x=x - 4x Plis help me!!

Mathematics

2 answers:

jeka943 years ago

7 0

Answer:x=4

Step-by-step explanation:

-8-x=x-4x

-8=-4x+x+x

-8=-2x

divide both sides by -2

x=4

hope it helped

Makovka662 [10]3 years ago

5 0

Answer:

x = 4

Step-by-step explanation:

Given

- 8 - x = x - 4x, that is

- 8 - x = - 3x ( add 3x to both sides )

- 8 + 2x = 0 ( add 8 to both sides )

2x = 8 ( divide both sides by 2 )

x = 4

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A rectangular box is to have a square base and a volume of 12 ft3. If the material for the base costs $0.17/ft2, the material fo

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(a)Length =2 feet

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Let the dimensions of the box be x, y and z

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Volume of the box $=12 ft^3\\$

$Therefore, x^2z=12\\z=\frac{12}{x^2}$

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Substituting $z=\frac{12}{x^2}$

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To minimize C(x), we solve for the derivative and obtain its critical point

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Recall: $z=\frac{12}{x^2}=\frac{12}{2^2}=3\\$

Therefore, the dimensions that minimizes the cost of the box are:

(a)Length =2 feet

(b)Width =2 feet

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