QuestionSuppose an Egyptian mummy is discovered in which the amount of carbon-14 present is only about three-fourths the amount found in living human beings. The amount of carbon-14 present in animal bones after $t$ years is given by $y=y_{0} e^{-0.0001216 t}$, where $y_{0}$ is the amount of carbon-14 present in living human beings. About how long ago did the Egyptian die?
About $\square$ yr ago the Egyptian had died. (Round to the nearest integer as needed.)