Help please! With explanation

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 - 0.3x-+ 700x -900. 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 parts (a)-(c) to estimate the profit resulting from the production and sale of 10 laptops weekly a) The current weekly profit is $ (Round to the nearest cent as needed.)