Practice 3 1. Find the value of the limit lim 4x - 3x + 5 x -+ 0 7+ 2x-2x2 a. 2 b. -1 C. g. N- VIA d. h . 2. The cost to produce x units of a certain product is given by C(x) = 10,000+ & + 7x2. Find the value of x that gives the minimum average cost. a. 40,000 4000 b. 400 th 500 C. 25 g . 160,000 d. 64 h . Does not exist 3. Let f(x) =x + 192x+ 17. Find the intervals on which fis decreasing. 4. The graph of fis given below. 10 (a) Where is f increasing? (b) Where is f decreasing? (c) Where is f concave upward? (d) Where is f concave downward? 5. Let f(x) = x4 - 4x3. Find the critical points of f and use them to determine an appropriate viewing rectangle for f. Then graph f using the viewing rectangle