This is Section 3.3 Problem 26(c2) :The function is represented by the graph in the textbook. Use the graph to find points that satisfy the following conditions. The answers should bet in avcending order of x values and either be an integer or an integer and a half such as ""1.5", Use " DNE" if wuch interval does not exist.Determine the points of f on the interval (0,4) at which r either equals zero or does not exist.Ahswer: (x1y1)=(. This is Section 3.3 Problem 26(c2):The function is represented by the graph in the textbook. Use the graph to find points that satisfy the following conditions. The answers should be in ascending order of x values and either be an integer or an integer and a half such as "'1.5". Use " DNE" if such interval dses not exist.Determine the points of f on the interval (0,4) at which f ether equals zero or does not exist.Answer: (x1,y1)=6,h(x2,x2)=1,), TRREMA189For each function in Exercises #27 to #30, do the following:(a) Find all x-values at which the first derivative is zero;(b) Use the signs of the first derivative to determine the intervals on which f is increasing,(c) Use the signs of the first derivative to determine the intervals on which f is decreasing,(d) Use the information from parts (b) and (c) to determine the relative extrema of f.(e) Determine the inflection points;(f) Use the signs of the second derivative to determine the intervals on which f is concave up;