By D. C. Champeney
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If x Ͼ Ϫ1, then f ͑x͒ x 2, so the part of the graph of f that lies to the right of the line x Ϫ1 must coincide with the graph of y x 2, which is a parabola. This enables us to sketch the graph in Figure 15. The solid dot indicates that the point ͑Ϫ1, 2͒ is included on the graph; the open dot indicates that the point ͑Ϫ1, 1͒ is excluded from the graph. The next example of a piecewise defined function is the absolute value function. Recall that the absolute value of a number a, denoted by a , is the distance from a to 0 on the real number line.
A) Sketch a possible graph of x͑t͒. (b) Sketch a possible graph of y͑t͒. (c) Sketch a possible graph of the ground speed. (d) Sketch a possible graph of the vertical velocity. 23. The number N (in millions) of US cellular phone subscribers is 1996 1998 2000 2002 2004 2006 N 44 69 109 141 182 233 (a) Use the data to sketch a rough graph of N as a function of t. (b) Use your graph to estimate the number of cell-phone subscribers at midyear in 2001 and 2005. 24. Temperature readings T (in °F) were recorded every two hours from midnight to 2:00 PM in Phoenix on September 10, 2008.
Let’s return to Zeno’s paradox. The successive positions of Achilles and the tortoise form sequences ͕a n͖ and ͕tn ͖, where a n Ͻ tn for all n. It can be shown that both sequences have the same limit: lim a n p lim tn nlϱ nlϱ It is precisely at this point p that Achilles overtakes the tortoise. The Sum of a Series Another of Zeno’s paradoxes, as passed on to us by Aristotle, is the following: “A man standing in a room cannot walk to the wall. In order to do so, he would first have to go half the distance, then half the remaining distance, and then again half of what still remains.