decays at a rate proportional to the amount present. You receive 1kg. After 80 days you have 250 grams. (a) What is the half-life? (b) How much is left after 120 days  You can answer these without using the exponential model formula. But could I get the expression in terms of logarithms first then the final value.

Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter2: Exponential, Logarithmic, And Trigonometric Functions
Section2.3: Applications: Growth And Decay
Problem 4E
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l decays at a rate proportional to the amount present. You receive 1kg. After 80 days you have 250 grams. (a) What is the half-life? (b) How much is left after 120 days 

You can answer these without using the exponential model formula. But could I get the expression in terms of logarithms first then the final value.

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