Problem 4-9 (24pts) For Problems 4-9, give the signs of the first and second derivatives for the function. Each derivative is either posi- tive everywhere, zero everywhere, or negative everywhere. 4. 5. f (x ) f (x) x 7. f Gx ) 9. f (x ) f (x) ANSWER& WORK for #4-9. Complete the table by using the signs >0,