1) Compute Ay and dy for y= x -2x + 7x as x changes from 6 to 5.9.4) A rock is dropped straight off a bridge that is 50 meters above the ground and falls at a speed of 10 m/sec. Another person is 7 meters away on the same bridge. At what rate is the distance between the rock and the second person increasing just as the rock hits the ground? (7 marks) Rock Dropped Here 7 meters Person Find Rate This Distance Changing Rock5) Use a linear approximation to estimate the number V1001 . (8 marks) 6) A manufacturer wants to design a box having a square base and a surface area of 108 cm-. Determine the dimension of the box which will produce a box with maximum volume. (10 marks)