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Unformatted text preview: years ago. (a) Find the decline rate. 2.107% (b) When will the population be 50% of the original? (find the half-life) 32.89 years 4) How long does it take amount to double at 8.5% compounded: a) annually b) continuously a) t = 8.496 b) t = 8.154 5) If the quantity of a certain radioactive substance is decreases by 5% in 10 hours, find the half-life. t = 135.13 hours 6) The population of a certain town is declining exponentially due to immigration. If only 80% of the original population are still in town after 10 years: a) Find the decline rate. 2.23% b) How long will it take for the population to be half what it was? 31.06 years...
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- Fall '09