12 21, 8.42 AM 24) Does this function have a critical point at r = 0? Yes. No. There is not enough information. 25) In which application is the derivative not used? Finding instantaneous rates of change Making linear approximations Optimizing relationships Calculating area under a curve 12712/21, 8.42 AM Thinkwell | 501 Test 5. Chapter 8 Curve Sketching 23) Which of the following curves is the graph of the equation f ( z) = _ 12 - x - 6, 12 + 1 - 2