tailieunhanh - Calculus: An Integrated Approach to Functions and their Rates of Change, Preliminary Edition Part 14

Calculus: An Integrated Approach to Functions and their Rates of Change, Preliminary Edition Part 14. A major complaint of professors teaching calculus is that students don't have the appropriate background to work through the calculus course successfully. This text is targeted directly at this underprepared audience. This is a single-variable (2-semester) calculus text that incorporates a conceptual re-introduction to key precalculus ideas throughout the exposition as appropriate. This is the ideal resource for those schools dealing with poorly prepared students or for schools introducing a slower paced, integrated precalculus/calculus course | Composition of Functions 111 EXERCISE EXERCISE EXAMPLE Let x x2 and g x x 1. a Find A x g x and sketch the graph of A. Use any means at your disposal. b Find j x g x and sketch the graph of j. c Now look at parts a and b as variations on the theme x x2. i. In part a the input of is increased by 1. What is the effect on the graph ii. In part b the output of is increased by 1. What is the effect on the graph Let x 1 x and g x x 2 . a Find A x g x and sketch the graph of A. b Find j x g x and sketch the graph of j. c Now look at parts a and b as variations on the theme x 1 x. i. In part a the input of is increased by 2. What is the effect on the graph ii. In part b the output of is increased by 2. What is the effect on the graph An oil spill on a large lake. Let s return to our model of an oil spill where oil spreads out into a thin expanding disk. In Chapter 2 we looked at how the area of the disk of oil varies with the radius. Of more practical importance is how the area of the spill varies with time. Is the leak steady worsening or slowing down Suppose the cannister from which the oil is leaking is opaque so we can t take our measurement directly from there. Instead we measure the radius of the spill in yards at various times. The idea is to express the radius r as a function of time r g i . Then since we can express the area of the spill as a function of the radius A r r2 we will be able to replace r by g i obtaining A f g t . The composition g i allows us to express the area as a function of time. Suppose we measure the radius of the spill at one-hour intervals. The information is recorded below. 6 Time hr 0123456789 10 Radius A plot of the results of our measurements is given in Figure . The graph of r versus i should be modeled by a continuous function because r is continuously increasing. 6 Note that if measurements had been taken just for i 4 5 6 7 8 and 9 and if the radius of the .

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