The decay equation for radon-222 gas is known to be y = y0 e-0.18t, with t in days. About how long will it take the radon in a sealed sample of air to fall to 90% of its original value?

College Algebra
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ISBN:9781938168383
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Chapter6: Exponential And Logarithmic Functions
Section6.7: Exponential And Logarithmic Models
Problem 15TI: Cesium-137 has a half-life of about 30 years. If we begin with 200 mg of cesium-137, will it take...
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The decay equation for radon-222 gas is known to be y = y0 e-0.18t, with t in days. About how long will it take the radon in a sealed sample of air to fall to 90% of its original value?

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