I will help you but I need to know what you need help with , find the area or volume?
We can get the Profit function P(x) from the Hint.
the Profit function is: P(x) = xp(x) - C(x) = -0.00041 x2 + 4x - 600
Attention: don't get confuse by the <span>big P of the profit with the small p of the price</span> To calculate the maximum profit, we need to find the derivative of P(x) then set it to 0 then find x: dP(x)/dx = -0.00082 x + 4 = 0 , so x = 4/0.00082 = 4,878 copies each month.
Step-by-step explanation:
Equation: 
First step:

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Answer:
Step-by-step explanation:
Hello! I am not sure 100% but I would say B
Hope this helps