Population growth in the U. S. between 1800 and 1850, in millions, can be represented by the function f, defined by f(t)=5 * e^(0.028t)
a. what was the U. S. population in 1800?
b. graph the equations y= f(t) and y=20.
c. what is the point of intersection of the two graphs, and what does it mean in this situation?