The total annual revenue (in billions of dollars) for the Boeing Corporation from 1990 to 2002 is given by R(t) = 0.1t - 5) + 80 where t=0 is January 1, 1990. The annual revenue (also in billions of dollars) that Boeing made just from sales of its 737 airplane in the same period is given by A(t) = -0.18(t - 8) + 30 In what year and month was annual revenue excluding sales of 737s at a minimum Select an answer What was that minimum revenue (in billion dollars per year)? (nearest 0.1 billion dollars per year)