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Mathematics, 19.07.2019 06:30 alwaysneedhelp84

Asubstance decays 18℅ each day. after 11 days, there are 13 milligrams of the substance remaining. how many milligrams were there initially? round to two decimals

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Asubstance decays 18℅ each day. after 11 days, there are 13 milligrams of the substance remaining. h...
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