I need help on all three

The profit P (in thousands of dollars) for a company spending an amount s (in thousands of dollars) on advertising is shown below | 1 P=-_13 41552+ 400 1 10 ' 0] T % (a) Find the amount of money (in dollars) the company should spend on advertising in order to yield a maximum profit. i $ (b) The point of diminishing returns is the point at which the rate of returns (in dollars). growth of the profit function begins to decline. Find the point of diminishing $ 15. DETAILS MY NOTES 0/2 Submissions Used k | Find the x-values (if any) at which f is not continuous. If there are any discontinuities, determine whether they are removable. (Enter your | answers as comma-separated lists, If an answer does not exist, enter DNE.) | { i3 | fix) = > | e =9 nonremovable discontinuities X = removable discontinuities X = \\: 116, DETAILS MY NOTES 1/2 Submissions Used PREVIOUS ANSWERS Find the indenite integral. (Remember to use absolute values where appropriate. Remember the constant of integration.) j dx | x(n(x2)S MRS e )