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To help the plants in his garden grow, Andrew decides to start composting. He wants to build a compost box in the shape of a rectangular prism that holds 30 gallons, or 6,930 cubic inches, of compost. He wants the box to be 40 inches long to fit perfectly alongside his shed. The height of the box will be equal to its width.

1. Which equation can you use to find the width of the compost box?

[tex] 6,930 = 40 \cdot w \cdot w [/tex]

2. To the nearest tenth of an inch, what is the width of the compost box?

[tex] \square \text{ inches} [/tex]

Answer :

To find the width of the compost box, let's break down the problem step-by-step.

1. Understand the Volume Equation: The volume of the compost box is given as 6,930 cubic inches. The box is shaped like a rectangular prism, and the formula for the volume [tex]\( V \)[/tex] of a rectangular prism is:
[tex]\[
V = \text{length} \times \text{width} \times \text{height}
\][/tex]

2. Substitute Known Values: We know that the length of the box is 40 inches, and both the width and the height of the box are the same, so let's call them both [tex]\( w \)[/tex].
[tex]\[
6,930 = 40 \times w \times w
\][/tex]
This simplifies to:
[tex]\[
6,930 = 40w^2
\][/tex]

3. Solve for [tex]\( w \)[/tex]: To find [tex]\( w \)[/tex], we first need to isolate [tex]\( w^2 \)[/tex] by dividing both sides of the equation by 40:
[tex]\[
w^2 = \frac{6,930}{40}
\][/tex]

4. Calculate [tex]\( w^2 \)[/tex]:
[tex]\[
w^2 = 173.25
\][/tex]

5. Find [tex]\( w \)[/tex]: To solve for [tex]\( w \)[/tex], take the square root of both sides:
[tex]\[
w = \sqrt{173.25}
\][/tex]

6. Round the Result: After solving the equation, we find that:
[tex]\[
w \approx 13.2
\][/tex]

Therefore, the width of the compost box is approximately 13.2 inches.

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Rewritten by : Barada