Let's say that you collected a rock while on spring break. Suppose you want to know the absolute age of a rock sample so you have the isotopic composition of the rock analyzed. Suppose the laboratory report indicates there are 7 times as much daughter isotope as parent isotope in the rock. Given that the half-life of the isotope pair is 280 million years, how old is the rock sample?   4500 million years   280 million years   840 million years   1 million years   2240 million years

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