Digital Camera Sales The factory sales (in millions of
dollars) of digital cameras in the United States from 1998 through 2003 are shown in the table. The time (in years) is given by t, with t =8 corresponding to 1998.
Year t, 8, 9, 10, 11, 12, 13
Sales f(t), 519, 1209, 1825, 1972, 2794, 3421
(a) Does f^-1 exist?
(b) If f^-1 exists, what does it represent in the context of the problem?
(c) If f^-1 exists, find f^-1 (1825)
(d) If the table was extended to 2004 and if the factory sales of digital cameras for that year was $2794 million, would f^-1 exist? Explain.