U.S. Population The U.S. population was 180 million in 1960 and 309 million in 2010.
a. Use these data to give an exponential growth model showing the U.S. population P as a function of time t in years since 1960. Round coefficients to 6 significant digits. HINT [See Example 2.]
b. By experimenting, determine the smallest number of significant digits to which you should round the coefficients in part (a) in order to obtain the correct 2010 population figure accurate to 3 significant digits.
c. Using the model in part (a), predict the population in 2020.
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