\fExam.pdf Page 5 > of 8. (3 points) Find dy/dx and day/ dx2. For which values of t is the curve concave upward? x = t2 + 1, y = et -1. 9. (2 points) The Cartesian coordinates of a point are (3, 3V/3). a. Find a polar coordinate (r, 0) of the point where r > 0 and 0 S 0