Hi there!
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I believe your answer is:
18in³
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Here’s why:
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Assuming that the figure is a rectangular prism:
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[tex]\boxed{\text{Volume of a rectangular prism is:}}\\\\V = l * w * h\\-----------\\V = 2 * 2.25 * 4\\\\\boxed{V = 18}[/tex]
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Hope this helps you. I apologize if it’s incorrect.