Total net shipments of aluminum (in billions of pounds) are approximated by g(x) = 15.4 + 2.935 ln (x+1), where x = 0 corresponds to 1990.
a) How many pounds of aluminum were shipped in 2003 and 2006?
b) Assuming the continued accuracy of the model, when will aluminum shipments reach 28,200,000,000 pounds.