233 2.3 Functions 27. x 0 2 y 2 28. –3 4 x y 0 29. 0 3 2 x y Determine whether each relation defines a function, and give the domain and range. See Examples 1–4. 19. 511, 12, 11, -12, 10, 02, 12, 42, 12, -426 20. 512, 52, 13, 72, 13, 92, 15, 1126 21. 2 5 11 17 3 1 7 20 22. 1 2 3 5 10 15 19 27 24. x y 0 0 1 -1 2 -2 23. x y 0 0 -1 1 -2 2 x y 3 -4 7 -4 10 -4 18. x y -4 22 0 22 4 22 17. 25. Number of Visits to U.S. National Parks Year, x Number of Visits, y (millions) 2014 70.7 2015 77.0 2016 84.2 2017 85.5 Data from National Park Service. 26. Attendance at NCAA Women’s College Basketball Games Season* x Attendance y 2015 11,123,533 2016 11,366,943 2017 11,346,021 2018 11,495,642 Data from NCAA. * Each season overlaps the given year with the previous year. 30. –4 4 3 0 –3 x y 31. 3 0 –3 –4 4 x y 32. –2 2 4 0 x y
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