Amammoth carving, designed out of a horse's shoulder blade, was found in waters covering the ancient
bering strait and land bridge. a 0.500-gram piece of this bone was observed to undergo 1,187 carbon-14
decays in a 1-hour period. a 0.500-gram piece of bone from a modern source underwent 7,251 carbon-14
decays in the same period. approximately how old is this bone carving?