Chapter 3 The Integral Business Calculus 197
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1 Chapter The Integral Business Calculus 97 Chapter Exercises. Let A(x) represent the area bounded by the graph and the horizontal axis and vertical lines at t=0 and t=x for the graph in Fig.. Evaluate A(x) for x =,,, 4, and 5. Figure. Let B(x) represent the area bounded by the graph and the horizontal axis and vertical lines at t=0 and t=x for the graph in Fig. 4. Evaluate B(x) for x =,,, 4, and 5. Figure. Let C(x) represent the area bounded by the graph and the horizontal axis and vertical lines at t=0 and t=x for the graph in Fig. 5. Evaluate C(x) for x =,, and and find a formula for C(x). Figure 4. Let A(x) represent the area bounded by the graph and the horizontal axis and vertical lines at t=0 and t=x for the graph in Fig. 6. Evaluate A(x) for x =,, and and find a formula for A(x). This chapter is (c) 0. It was remixed by David Lippman from Shana Calaway's remix of Contemporary Calculus by Dale Hoffman. It is licensed under the Creative Commons Attribution license.
2 Chapter The Integral Business Calculus 98 Figure 4 5. A car had the velocity shown in Fig. 7. How far did the car travel from t= 0 to t = 0 seconds? Figure 5 6. A car had the velocity shown in Fig. 8. How afar did the car travel from t = 0 to t = 0 seconds? Figure 6
3 Chapter The Integral Business Calculus The velocities of two cars are shown in Fig. 9. (a) From the time the brakes were applied, how many seconds did it take each car to stop? (b) From the time the brakes were applied, which car traveled farther until it came to a complete stop? Figure 7 8. You and a friend start off at noon and walk in the same direction along the same path at the rates shown in Fig. 40. (a) Who is walking faster at pm? Who is ahead at pm? (b) Who is walking faster at pm? Who is ahead at pm? (c) When will you and your friend be together? (Answer in words.) Figure 8
4 Chapter The Integral Business Calculus Police chase: A speeder traveling 45 miles per hour (in a 5 mph zone) passes a stopped police car which immediately takes off after the speeder. If the police car speeds up steadily to 60 miles/hour in 0 seconds and then travels at a steady 60 miles/hour, how long and how far before the police car catches the speeder who continued traveling at 45 miles/hour? (Fig. 4) Figure 9 0. Water is flowing into a tub. The table shows the rate at which the water flows, in gallons per minute. The tub is initially empty. t, in minutes Flow rate, in gal/min Use the table to estimate how much water is in the tub after a. five minutes b. ten minutes. The table shows the speedometer readings for a short car trip. t, in minutes Speed, in mph a. Use the table to estimate how far the car traveled over the twenty minutes shown. b. How accurate would you expect your estimate to be?
5 Chapter The Integral Business Calculus The table shows values of f ( t). Use the table to estimate ( t) f dt. t f t ( ). The table shows values of g ( x). x g x ( ) Use the table to estimate 0 a. g ( x) 6 b. g ( x) 6 0 c. g ( x) dx dx dx 4. What are the units for the "area" of a rectangle with the given base and height units? Base units Height units "Area" units miles per second seconds hours dollars per hour square feet feet kilowatts hours houses people per house meals meals
6 Chapter The Integral Business Calculus 0 In problems 5 7, represent the area of each bounded region as a definite integral, and use geometry to determine the value of the definite integral. 5. The region bounded by y = x, the x axis, the line x =, and x =. 6. The region bounded by y = 4 x, the x axis, and the y axis. 7. The shaded region in Fig. 4. Figure 0 8. Fig. 4 shows the graph of f and the areas of several regions. Evaluate: 5 7 (a) f(x) dx (b) f(x) dx (c) f(x) dx 0 Figure
7 Chapter The Integral Business Calculus 0 9. Fig. 44 shows the graph of g and the areas of several regions. 4 g(x) dx 8 (c) 4 Evaluate : (a) 8 g(x) dx (d) g(x) dx (b) 8 g(x) dx (e) g(x) dx Figure 0. Fig. 45 shows the graph of h. Use the graph to evaluate: 6 (a) h(x) dx (b) h(x) dx (c) h(x) dx (d) h(x) dx Figure
8 Chapter The Integral Business Calculus 04. Your velocity along a straight road is shown in Fig. 46. How far did you travel in 8 minutes? Figure 4. Your velocity along a straight road is shown in Fig. 47. How many feet did you walk in 8 minutes? Figure 5 In problems - 6, the units are given for x and for f(x). Give the units of a b f(x) dx.. x is time in "seconds", and f(x) is velocity in "meters per second." 4. x is time in "hours", and f(x) is a flow rate in "gallons per hour." 5. x is a position in "feet", and f(x) is an area in "square feet." 6. x is a position in "inches", and f(x) is a density in "pounds per inch."
9 Chapter The Integral Business Calculus 05 In problems 7, represent the area with a definite integral and use technology to find the approximate answer. 7. The region bounded by y = x, the x axis, the line x =, and x = The region bounded by y = x, the x axis, and the line x = The shaded region in Fig. 48. Figure 6 0. The shaded region in Fig. 49. Figure 7. The shaded region in Fig. 49 for x. + x dx. 0 (a) Using six rectangles, find the left-hand Riemann sum for this definite integral. (b) Using six rectangles, find the right-hand Riemann sum for this definite integral. (c) Using geometry, find the exact value of this definite integral.. Consider the definite integral ( )
10 Chapter The Integral Business Calculus 06. Consider the definite integral x dx. 0 (a) Using four rectangles, find the left-hand Riemann sum for this definite integral. (b) Using four rectangles, find the right-hand Riemann sum for this definite integral. Problems 4 4 refer to the graph of f in Fig. 50. Use the graph to determine the values of the definite integrals. (The bold numbers represent the area of each region.) Figure f(x) dx 5. f(x) dx 6. 7 f(x) dx f(w) dw 8. 0 f(x) dx f(x) dx f(t) dt 4. 5 f(x) dx Problems 4 47 refer to the graph of g in Fig. 5. Use the graph to evaluate the integrals. Figure g(x) dx 4. 5 g(t) dt 44. g(x) dx 0
11 Chapter The Integral Business Calculus g(s) ds g(t) dt g(x) dx 48. Write the total distance traveled by the car in Fig. 5 between pm and 4 pm as a definite integral and estimate the value of the integral. Figure Write the total distance traveled by the car in Fig. 5 between pm and 6 pm as a definite integral and estimate the value of the integral. For problems 50-67, find the indicated antiderivative. 5 + dx 5. (.5x x. 5)dx 5..dy 5. π dw 50. ( x 4x 5) 54. e P x dp 55. x + e dx 4x 56. dx x 57. dx x
12 Chapter The Integral Business Calculus 08 t + dx ( x )( x ) ( 4x ) 6. (.000) dx 5 t t 00 x 6. e dx 0 / x t e dt 6. dx x 64. w + 5 dw 65. 6x x dx dx 66. x ln x dt x 67. dx x 6x + 5 For problems 68-79, find an antiderivative of the integrand and use the Fundamental Theorem to evaluate the definite integral x dx 69. x dx 70. (x + 4x ) dx 7. e x dx e x x dx 7. dx 5 x 77. x + 0 x dx 74. dx dx x e x dx dx x 4 (x ) dx 80. Find the area shown in Fig. 5 Figure
13 Chapter The Integral Business Calculus Find the area shown in Fig. 54 Figure 8. Find the area shown in Fig Find the area shown in Fig. 56 Figure Figure 4
14 Chapter The Integral Business Calculus 0 In problems 84 87, use the values in the table to estimate the areas. x f ( x) g ( x) h ( x) Estimate the area between f and g, between x = 0 and x = Estimate the area between g and h, between x = 0 and x = Estimate the area between f and h, between x = 0 and x = Estimate the area between f and g, between x = 0 and x = Estimate the area of the island in Fig. 57. Figure 5 In problems 89 98, find the area between the graphs of f and g for x in the given interval. Remember to draw the graph! 89. f(x) = x +, g(x) = and x. 90. f(x) = x +, g(x) = + x and 0 x. 9. f(x) = x, g(x) = x and 0 x. 9. f(x) = (x ), g(x) = x + and 0 x. 9. f(x) = x, g(x) = x and x e. 94. f(x) = x, g(x) = x and 0 x 4.
15 Chapter The Integral Business Calculus 95. f(x) = 4 x, g(x) = x + and 0 x. 96. f(x) = e x, g(x) = x and 0 x. 97. f(x) =, g(x) = x and 0 x. 98. f(x) =, g(x) = 4 x and x. In problems 99 and 00, use the values in the table to estimate the average values. x f ( x) g ( x) Estimate the average value of f on the interval [0, 6]. 00. Estimate the average value of g on the interval [0, 6].
16 Chapter The Integral Business Calculus In problems 0 06, find the average value of f on the given interval. Figure 6 0. f(x) in Fig. 58 for 0 x. 0. f(x) in Fig. 58 for 0 x f(x) in Fig. 58 for x f(x) in Fig. 58 for 4 x f(x) = x + for 0 x f(x) = x for 0 x. 07. Fig. 59 shows the velocity of a car during a 5 hour trip. (a) Estimate how far the car traveled during the 5 hours. (b) At what constant velocity should you drive in order to travel the same distance in 5 hours? Figure 7
17 Chapter The Integral Business Calculus 08. Fig. 60 shows the number of telephone calls per minute at a large company. (a) Estimate the average number of calls per minute from 8 am to 5 pm. (b) From 9 am to pm. Figure The demand and supply functions for a certain product are given by p = 50. 5q and p =.00q +.5, where p is in dollars and q is the number of items. (a) Which is the demand function? (b) Find the equilibrium price and quantity (c) Find the total gains from trade at the equilibrium price. 0. Still thinking about the product from Exercise 09, with its demand and supply functions, suppose the price is set artificially at $70 (which is above the equilibrium price). (a) Find the quantity supplied and the quantity demanded at this price. (b) Compute the consumer surplus at this price, using the quantity demanded. (c) Compute the producer surplus at this price, using the quantity demanded (why?). (d) Find the total gains from trade at this price. (e) What do you observe?. When the price of a certain product is $40, 5 items can be sold. When the price of the same product costs $0, 85 items can be sold. On the other hand, when the price of this product is $40, 00 items will be produced. But when the price of this product is $0, only 00 items will be produced. Use this information to find supply and demand functions (assume for simplicity that the functions are linear), and compute the consumer and producer surplus at the equilibrium price.. Find the present and future values of a continuous income stream of $5000 per year for years if money can earn.% annual interest compounded continuously.
18 Chapter The Integral Business Calculus 4. Find the present value of a continuous income stream of $40,000 per year for 5 years if money can earn (a) 0.8% annual interest, compounded continuously, (b).5% annual interest, compounded continuously, (c) 4.5% annual interest, compounded continuously. 4. Find the present value of a continuous income stream F ( t) = 0 + t, where t is in years and F is in tens of thousands of dollars per year, for 0 years, if money can earn % annual interest, compounded continuously. 5. Find the present value of a continuous income stream F ( t) = + 0.t, where t is in years and F is in thousands of dollars per year, for 8 years, if money can earn.7% annual interest, compounded continuously. 6. Find the future value of a continuous income stream F ( t) = t + 00 in years and F is in dollars per year, for 5 years, if money can earn 6% annual interest, compounded continuously., where t is 7. A business is expected to generate income at a continuous rate of $5,000 per year for the next eight years. Money can earn.4% annual interest, compounded continuously. The business is for sale for $5,000. Is this a good deal?
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