19. [-I1 Points] DETAILS MY NOTES Math 110 Course Resources - Curve Sketching Course Packet on classifying critical points using the rst derivative test - Curve Sketching Course Packet on classifying critical points using the second derivative test Determine the X-coordinates of the relative extrema of the function 99:} = Enter each answer as a comma-separated list of values. The order of the values does not matter. Enter DNE if 9:?) does not have any relative maximum or minimum values, respectively. x-coordinates of the relative maxima = x-coordinates of the relative minima = |:| 20. [-.-"1 Points] DETAILS MY NOTES Math 110 Course Resources ' - Curve Sketching Course Packet on intervals of concavity Let x} 2 x95\". Determine the intervals of concavitv of x}. Enter your answer using interval notation. fis concave up on fis concave clown on |:|