The final answer for this question is 591.28 cubic cm
Randomly assigned group. the art class isn't random and only consists of a select type of people--it is not a representative sample; maybe more left handed people enjoy art than do right handed people! therefore, even though the randomly assigned group is smaller, it is the better estimate.
Close enough, it would be 36+6x.
Both solutions:
x = -1, -7/3
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