Let f(6) = 5111(6) + (305(6). Calculate the derivative. [Note: to get the 9 to show up type theta, and the system will immediately convert the word to the symbol.] W) = List the first interval after 0 where both endpoints of the interval are critical numbers of the function on which f is increasing? List the first interval after 0 where both endpoints of the interval are critical numbers of the function on which f is decreasing