After its fastest rate of growth ever during the 1980s and 1990s, the rate of growth of world population is expected to slow dramatically in the twentyrst century. The function G(t) = 1.5390-213' gives the projected annual average percent population growth per decade in the tth decadeI with t = 1 corresponding to 2000. (Source: U.S. Census Bureau.) (a) 1.Mhat will the projected annual average population growth rate be in 2030? {Round your answer to two decimal places.) {b} How fast will the projected annual average population growth rate be changing in 2030? [Round your answer to two decimal places.}