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Question: only problems 12 15 18 and 21...

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Only problems 12 ,15 ,18 ,and 21
62 CHAPTER 1 Functions and Their Graphs In Problems 11-22, determine whether the graph is that of a function by using the vertical-line test.If it is use the graph to find (a) The domain and range (b) The intercepts if any (c) Any symmetry with respect to the r-axis, the y-axis or the origin 12. \13, 14. у 3 x 15.y 16, 18. 3(3.2) 4 (4,3) 3 x 3 x 19. 20. 21. In Problems 23-28, answer the questions about the given function 23. f(x) 2x2 1 x2+ 2 26. )2
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