3. A certain substance has a decay rate proportional to amount present. It is observe that it has an initial amount of 100kg. After 2 years it is found that 30% of its original amount was decomposed. What percentage of this substance was decomposed after 1 year and 3 months?

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter5: Inverse, Exponential, And Logarithmic Functions
Section: Chapter Questions
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2. A body at 100°C warms at 120°C after 5 minutes in a surrounding at 30°C. At what time will its temperature be double that
at the beginning?
3. A certain substance has a decay rate proportional to amount present. It is observe that it has an initial amount of 100kg.
After 2 years it is found that 30% of its original amount was decomposed. What percentage of this substance was
decomposed after 1 year and 3 months?
Transcribed Image Text:2. A body at 100°C warms at 120°C after 5 minutes in a surrounding at 30°C. At what time will its temperature be double that at the beginning? 3. A certain substance has a decay rate proportional to amount present. It is observe that it has an initial amount of 100kg. After 2 years it is found that 30% of its original amount was decomposed. What percentage of this substance was decomposed after 1 year and 3 months?
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