# Calc

posted by
**Liz** on
.

The U.S. population is approximated by the function

P(t) =

556

1 + 3.72e−0.5t

where P(t) is measured in millions of people and t is measured in 30-year intervals, with t = 0 corresponding to 1930. What is the expected population of the United States in 2020 (t = 3)? (Round your answer to the nearest whole number.)

million people