The expression that represents profit in the given example is
33x+390.
It is given that
Revenue function = [tex]2x^3 +30x-130[/tex]
Cost function = [tex]2x^3-3x-520[/tex]
Profit function = revenue function- cost function
Profit function= [tex]{2x^3 +30x-130}-{2x^3+3x+520[/tex]
profit function= 33x+390
Therefore, the expression that represents profit in the given example is
27x-650
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