The amount of popcorn consumed in the United States (in millions of pounds) was: 353 in 1970, 393 in 1975, 568 in 1980, 670 in 1985, 700 in 1986, 741 in 1987, 807 in 1988, and 872 in 1989.
(a) Find a line of best fit for this data and
(b) use it to project the popcorn consumption in 1999.
(c) In what year would you expect consumption to first exceed one billion pounds?