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A company that sells prefabricated homes ships the frames for each home in large shipping containers. Each shipping container is in the shape of a rectangular prism, and its volume can be represented by the polynomial expression [tex]5x^3 + 7.5x^2[/tex], where [tex]x[/tex] is the width of the shipping container.

If the length of the shipping container is five times the width, write the expression that represents the height of the shipping container in terms of its width, [tex]x[/tex].


Sagot :

To determine the height of a shipping container in terms of its width [tex]\( x \)[/tex], we start by understanding the given information:

1. The volume [tex]\( V \)[/tex] of the shipping container is given by the polynomial expression:
[tex]\[ V = 5x^3 + 7.5x^2 \][/tex]
2. The length [tex]\( L \)[/tex] of the container is five times its width [tex]\( x \)[/tex]:
[tex]\[ L = 5x \][/tex]
3. The volume of a rectangular prism is given by the product of its length [tex]\( L \)[/tex], width [tex]\( W \)[/tex], and height [tex]\( H \)[/tex]:
[tex]\[ V = L \cdot W \cdot H \][/tex]

Here, [tex]\( W \)[/tex] is the width, which is [tex]\( x \)[/tex]. So, substituting into the volume formula, we have:
[tex]\[ V = (5x) \cdot x \cdot H \][/tex]

First, substitute the given polynomial for [tex]\( V \)[/tex]:
[tex]\[ 5x^3 + 7.5x^2 = 5x^2 \cdot H \][/tex]

To solve for [tex]\( H \)[/tex], we divide both sides of the equation by [tex]\( 5x^2 \)[/tex]:
[tex]\[ H = \frac{5x^3 + 7.5x^2}{5x^2} \][/tex]

Now, we simplify the right-hand side:
[tex]\[ H = \frac{5x^3 + 7.5x^2}{5x^2} = \frac{5x^3}{5x^2} + \frac{7.5x^2}{5x^2} = x + 1.5 \][/tex]

Thus, the height [tex]\( H \)[/tex] of the shipping container in terms of its width [tex]\( x \)[/tex] is:
[tex]\[ H = x + 1.5 \][/tex]
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