Answer:
126 in^3
Explanation:
You Multiple the equation by each number there for you get 126 same with the ^3 when you add it all up together if you understand what I am saying like for example the equation: 15 x 2 + 18 x 2 + 30 x 2 = 126
15 x 2 + 18 x 2 + 30 x 2 = 126
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