ISM_T11_C01_H - Section 1.7 Graphing with Calculators and...

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Section 1.7 Graphing with Calculators and Computers 49 17. by 18. by Ò±&ß "Ó Ò±&ß&Ó Ò±&ß "Ó Ò±#ß %Ó 19. by 20. by Ò±%ß %Ó Ò!ß $Ó Ò±&ß &Ó Ò±#ß #Ó 21. by 22. by Ò±"!ß "!Ó Ò±'ß 'Ó Ò±&ß &Ó Ò±#ß #Ó 23. by 24. by Ò±'ß "!Ó Ò±'ß 'Ó Ò±$ß &Ó Ò±#ß "!Ó
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50 Chapter 1 Preliminaries 25. by 26. by Ò±!Þ!$ß !Þ!$Ó Ò±"Þ#&ß "Þ#&Ó Ò±!Þ"ß !Þ"Ó Ò±$ß $Ó 27. by 28. by Ò±$!!ß $!!Ó Ò±"Þ#&ß "Þ#&Ó Ò±&!ß &!Ó Ò±!Þ"ß !Þ"Ó 29. by 30. by Ò±!Þ#&ß !Þ#&Ó Ò±!Þ$ß !Þ$Ó Ò±!Þ"&ß !Þ"&Ó Ò±!Þ!#ß !Þ!&Ó 31. x x y y y x x . ## # ²# œ%²% ± Ê œ#„ ± ±# ²) È The lower half is produced by graphing yx x . œ#± ± ±# ²) È # 32. y x y x . The upper branch # ±"' œ"Ê œ „ "²"' È is produced by graphing y x . œ" ² " ' È #
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Section 1.7 Graphing with Calculators and Computers 51 33. 34. 35. 36. 37. 38 Þ 39. 40. 41. (a) y x œ "!&*Þ"% ± #!(%*(# (b) m dollars/year, which is the yearly increase in compensation. œ "!&*Þ"%
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52 Chapter 1 Preliminaries (c) (d) Answers may vary slightly. y 14 $ 899 œ "!&*Þ #!"! ± #!(%*(# œ &$ß ab a b 42. (a) Let C cost and x year. œœ Cx œ (*'!Þ(" ± "Þ' ‚ "! ( (b) Slope represents increase in cost per year (c) C x œ #'$(Þ"% ± &Þ# ‚ "! ' (d) The median price is rising faster in the northease (the slope is larger). 43. (a) Let x represent the speed in miles per hour and d the stopping distance in feet. The quadratic regression function is dx x . œ !Þ!)'' ± "Þ*( ² &!Þ" # (b) (c) From the graph in part (b), the stopping distance is about feet when the vehicle is mph and it is about feet $(! (# &#& when the speed is mph. )& Algebraically: d ft.
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ISM_T11_C01_H - Section 1.7 Graphing with Calculators and...

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