The burden of man-made aerosol sulfate in the earth's atmosphere, in grams per square meter, is b(x, n) = xn a where x is the total weight of aerosol sulfate emitted into the atmosphere per year and n is the number of years it remains in the atmosphere. a is the surface area of the earth, approximately 5.1 × 1014 square meters.† (a) calculate the burden, given the 1995 estimated values of x = 1.5 × 1014 grams per year, and n = 5 days. (round the answer to three decimal places.)