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 30year 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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