Let P(t) be the percentage of Americans under the age of 18 at 3 x time . The table gives values of this function in census years from 1950 to 2000.

(a) What is the meaning of P€™ (t)? What are its units?
(b) Construct a table of values for P€™ (t).
(c) Graph P and P€™.
(d) How would it be possible to get more accurate values for P€™(t)?

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P(1) P(t) 1950 31.1 1980 28.0 1960 35.7 1990 25.7 25.7 1970 34.0 2000