A box, with a square base is to have a volume of V = 360 cubic inches. The cost for the materials of the four sides is $6 per square inch, while the cost of the material for the top and bottom is $10 per square inch. y X X

Calculus: Early Transcendentals
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ISBN:9781285741550
Author:James Stewart
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Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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C'(x) = 

Solving C'=0 yields that value of x that minimizes the cost. X=____inches

y=_____inches

### Problem Description:

A box, with a square base, is to have a volume of \( V = 360 \) cubic inches. The cost for the materials of the four sides is $6 per square inch, while the cost of the material for the top and bottom is $10 per square inch.

### Diagram Description:

The diagram provided is a 3D representation of a rectangular box with one dimension labeled as \( x \) (the length of the side of the square base) and another dimension labeled as \( y \) (the height of the box). The other dimension of the square base is also indicated as \( x \).

### Goals:

1. Determine the dimensions \( x \) and \( y \) that minimize the total cost of the materials used to build the box.
2. Calculate the total minimum cost based on these dimensions.

### Formulas and Calculations:

#### Volume of the Box:
\[ V = x^2 \cdot y \]
Given \( V = 360 \) cubic inches:
\[ x^2 \cdot y = 360 \]
\[ y = \frac{360}{x^2} \]

#### Surface Area Calculations:

- **Area of the Four Sides:**
  - Each side of the box has an area of \( x \cdot y \).
  - There are four sides, hence the total area for the sides is \( 4 \cdot (x \cdot y) = 4xy \).

- **Area of the Top and Bottom:**
  - Each of the top and bottom has an area of \( x \cdot x = x^2 \).
  - There are two such surfaces, hence the total area for the top and bottom is \( 2x^2 \).

#### Cost Calculations:

- **Cost for the Four Sides:**
  \[ \text{Cost of sides} = 4xy \cdot 6 \]

- **Cost for the Top and Bottom:**
  \[ \text{Cost of top and bottom} = 2x^2 \cdot 10 \]

- **Total Cost (C):**
  \[ \text{Total cost} = 24xy + 20x^2 \]

### Summary:

To minimize the total cost of the materials, we need to determine the optimal values of \( x \) and \( y \) under the constraint \( x^
Transcribed Image Text:### Problem Description: A box, with a square base, is to have a volume of \( V = 360 \) cubic inches. The cost for the materials of the four sides is $6 per square inch, while the cost of the material for the top and bottom is $10 per square inch. ### Diagram Description: The diagram provided is a 3D representation of a rectangular box with one dimension labeled as \( x \) (the length of the side of the square base) and another dimension labeled as \( y \) (the height of the box). The other dimension of the square base is also indicated as \( x \). ### Goals: 1. Determine the dimensions \( x \) and \( y \) that minimize the total cost of the materials used to build the box. 2. Calculate the total minimum cost based on these dimensions. ### Formulas and Calculations: #### Volume of the Box: \[ V = x^2 \cdot y \] Given \( V = 360 \) cubic inches: \[ x^2 \cdot y = 360 \] \[ y = \frac{360}{x^2} \] #### Surface Area Calculations: - **Area of the Four Sides:** - Each side of the box has an area of \( x \cdot y \). - There are four sides, hence the total area for the sides is \( 4 \cdot (x \cdot y) = 4xy \). - **Area of the Top and Bottom:** - Each of the top and bottom has an area of \( x \cdot x = x^2 \). - There are two such surfaces, hence the total area for the top and bottom is \( 2x^2 \). #### Cost Calculations: - **Cost for the Four Sides:** \[ \text{Cost of sides} = 4xy \cdot 6 \] - **Cost for the Top and Bottom:** \[ \text{Cost of top and bottom} = 2x^2 \cdot 10 \] - **Total Cost (C):** \[ \text{Total cost} = 24xy + 20x^2 \] ### Summary: To minimize the total cost of the materials, we need to determine the optimal values of \( x \) and \( y \) under the constraint \( x^
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