Posted by **Liz** on Thursday, July 19, 2012 at 6:21pm.

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

- Calc -
**Reiny**, Thursday, July 19, 2012 at 6:31pm
Just evaluate P(3), (sub in 3 wherever you see a t )

btw, is this supposed to be a fraction?

- Calc -
**Liz**, Thursday, July 19, 2012 at 6:49pm
Not a fraction, so 331.7 thank you!!

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