if x < 0 29. f(x) =1 1x if x <0 if x 0 27. f(x) 28. f(x) X ifx - 0 xif x 0 if x >0 (3 + x if -3 x< 0 if x 0 32. f(x) int (2x) 30. f(x) =3 31. f(x) 2 int (x) if x > 0 In Problems 33-36, the graph of a piecewise-defined function is given. Write a definition for each function. ne 33 34. 35. A y 36. A Y A Y 2 2 (0, 2)2 2 (2, 1) 43. F dauyy bae (-1,0) (-1, 1) (2, 1) (1, 1) (-1, 1) ta X X X |(0, 0) (0, 0) (2, 0) -2 -2 (0,0) 2 -2 2 -2 (-1,-1) Revis 37. Cell Phone Service Sprint PCS offers a monthly cellular phone plan for $39.99. It includes 350 anytime minutes plus $0.25 per minute for additional minutes. The following func- tion is used to compute the monthly cost for a subscriber Monthly service charge $9.45 Per therm service charge 1st 50 therms $0.36375/therm Over 50 therms $0.11445/therm SCH 39.99 (0.25x 47.51 C(x)= if 0 x 350 Gas charge 0.6338/therm if x > 350 month Sing (a) What is the charge for using 50 therms in a (b) What is the charge for using 500 therms in a (c) Construct a function that relates the monthly for x therms of gas. (d) Graph this function. where x is the number of anytime minutes used. Compute the monthly cost of the cellular phone for the following any- mond chaps time minutes: (a) 200 (b) 365 (c) 351 Source: Sprint PCS. Source: The Peoples Gas Company, Chicago, Illinois, 2003 38. First-class Letter According to the U.S. Postal Service, first- class mail is used for personal and business correspondence. 40. Cost of Natural Gas In May 2003, Nicor Gas had d lowing rate schedule for natural gas usage in single Source sent as first-class mail. It includes Any mailable item may be postcards, letters, large envelopes, and small packages. The weight is 13 ounces, The residences:

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