Digital ACT Science Practice Question #1482
Test your problem-solving accuracy on this official-caliber item. Select an answer choice to check your reasoning instantly.
25% remaining = 2 half-lives. 2 * 1.25 = 2.50 billion years.
25% remaining corresponds to 2 half-lives (100% -> 50% -> 25%). 2 * 1.25 billion years = 2.50 billion years....
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