An electronics company kept comparative statistics on two products, a and b. for years 0 to 8, the total number of product a ever sold (in thousands) is given by the function a(x) = 74x + 250, where x is the number of years since year 0. for that same period, the total number of product b ever sold (in thousands) is given by the function b(x) = -30x + 434, where x is the number of years since year 0. find and interpret a(1.8) and b(1.8).