Need help answer both questions screenshot #1 and screenshot #2. thank your for your time i'll leave positive feedback, thank you again :)

The demand equation for a certain commodity is given by the following equation. P= - 10x + 300, OSX$60 12 Find x and the corresponding price p that maximize revenue. The maximum value of R(x) occurs at x = The corresponding price that maximizes revenue is $ (Type an integer or decimal rounded to two decimal places as needed.)For the function f(x) = 5x" - 5x# + 4x + 7x-+ 8, find f"(x), the third derivative of f, and f(#) (x), the fourth derivative of f. . ... . f'"(X) = ((4) ( x ) =