In order to add fractions you need to change the denominators to make sure they are the same. Then, all you have to do is add the two numerators like normal and keep the denominator the same.
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The volume of a rectangular prism (since that is not a cube because of the sides being a different measure) is l*w*h.
9*7*8=504.
The volume is 504cm^3. Therefore the answer is D. none of the above.
It was chord less sorry if wrong
A that a that is your answer iu hoped it helped you and its right