Section 7.1, Extension of Exercise 60 (page 552)
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Section 7.3, Extension of Exercises 79 and 80 (page 579)
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(a) 
(b) Art instructions: The scale marks are 1 on both axes.
(c) -2, 1, 3
(d) 
(e) Both equal to 2.
Section 7.5 Extension of Exercise 43 (page 594)
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Art instructions: Draw the graph of in 
The scale marks are 1 on both axes.
