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Correct Answer:

Box 1's volume is found by multiplying the area of the base (3x^2) by the height (x^3), which results in 3x^5. Since this expression has only one term, it is a monomial. Box 2's volume is found by multiplying its base area (4x^2 - x) by the height (x^3), using the distributive property: x^3(4x^2) - x^3(x) = 4x^5 - x^4. Since this expression has two terms, it is a binomial.