Answer:
just subtracting the expression for revenue from the expression for cost
Explanation:
2x^3 + 30x - 130
- 2x^3 - 3x - 520
(subtracting means adding the opposite)
2x^3 - 2x^3 = 0
30x - (-3x) = 33x
-130 - (-520) = 390
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