A particular computing company finds that its weekly profit, in dollars, from the production and sale of x laptop computers is P(x) = -0.003x^3 - 0.3x^2 + 500x - 700. Currently the company builds and sells 9 laptops weekly.
a) What is the current weekly profit?
b) How much profit would be lost if production and sales dropped to 8 laptops weekly?
c) What is the marginal profit when x = 9?
d) Use the answer from part (a)-(c) to estimate the profit resulting from the production and sale of 10 laptops weekly.