In 1980 the population of alligators in a particular region was estimated to be 1500. In 2008 the population had grown to an estimated 6500. Using the Malthusian law for population growth, estimate the alligator population in this region in the year 2020. The alligator population in this region in the year 2020 is estimated to be (Round to the nearest whole number as needed.) Substance A decomposes at a rate proportional to the amount of A present. It is found that 10 lb of A will reduce to 5 lb in 4.8 hr. After how long will there be only 1 Ib left? . . . There will be 1 lb left after hr. (Do not round until the final answer. Then round to the nearest whole number as needed.)