A radioactive substance decays at a continuous rate of 14% per year, and 50 mg of the substance is present in the year 2009. (a) Write a formula for the amount present, A (in mg), t years after 2009. A = 50(0.86)' OA=50e-141 OA = 50e14! A = 50e0.141 A = 50e-0.14 (b) How much will be present in the year 2023?

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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A radioactive substance decays at a continuous rate of 14% per year, and 50 mg of the substance is present in the year 2009.
(a) Write a formula for the amount present, A (in mg), t years after 2009.
A = 50(0.86)'
OA=50e-141
OA = 50e14!
A = 50e0.141
A = 50e-0.14
(b) How much will be present in the year 2023?
Transcribed Image Text:A radioactive substance decays at a continuous rate of 14% per year, and 50 mg of the substance is present in the year 2009. (a) Write a formula for the amount present, A (in mg), t years after 2009. A = 50(0.86)' OA=50e-141 OA = 50e14! A = 50e0.141 A = 50e-0.14 (b) How much will be present in the year 2023?
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