The profit (in thousands of dollars) from expenditure of x thousand dollars on advertising is given by P(x) = 2,000 + 64x - 4x2. The firm is presently spending $7,000 on advertising. Which of the following is true? The profit (in thousands of dollars) from expenditure of x thousand dollars on advertising is given by P(x) = 2,000 + 64x - 4x2. The firm is presently spending $7,000 on advertising. Which of the following is true? The firm is at the break even point Profit is maximized The slope of the profit function is positive The slope of the profit function is negative