Cost (dollars) Postage Rate The graph shows the cost (in dollars) to mail a letter that weighs one ounce during certain years. 32. (2002, 0.37) 0.4 (1995, 0.32) (1999,0.33) 0.3 (2001,0.34)- (1991, 0.29) 0.2 a. Determine the time interval during which the cost to mail a one-ounce letter showed the greatest rate of change. b. Determine the time interval during which the cost to mail a one-ounce letter showed the least rate of change. 0.1 0.0A 1992 1994 1996 1998 2000 2002 Year

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