The expression that is equal is 72 or 4935
Answer:
Step-by-step explanation:
So they can get prepared for the future
20,146,974. 78,901,234. 46,123,086.
76,543,218. 54,876,547
Answer:
60.5 milligrams per square centimeter First, determine how many half lives have expired by dividing the time by the half-life. So: 55/20 = 2.75 That means that only 2^(-2.75) = 0.148650889 = 14.8650889% of the original substance remains. So just divide the amount remaining by 0.148650889 to get the original amount. 9 / 0.148650889 = 60.5445419 So originally, there was 60.5 milligrams per square centimeter 55 years ago.
Answer:
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Step-by-step explanation:
