12. The volume of a box is V(x) = (2x3 + 7x2 + 3x) cubic centimeters. Which of the following expressions represents its length? %3D x + 3 ? A. (x + 1) centimeters C. (2x + 1) centimeters B. (x + 2) centimeters D. (2x + 2) centimeters 13. If the value of x in item 12 is 2, what is the actual volume of the box? A. 60 cubic cm С. 40 сubic cт В. 50 сubic ст D. 30 cubic cm

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