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Exponential Growth and Decay  Problem 7
Alissa Fong
Alissa Fong
MA, Stanford University
Teaching in the San Francisco Bay Area
Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts
Since we know the halflife time for many elements that naturally occur in nature, we can use exponential modeling to describe decay of organic material and make predictions about the age of fossils based on how much material is left. Here, we look at Carbon14 to predict the age of a fossil. Keep in mind that for all halflives, the ratio of amount after time to starting amount will be 1/2.
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Alissa Fong
M.A. in Secondary Mathematics, Stanford University
B.S., Stanford University
Alissa has a quirky sense of humor and a relatable personality that make it easy for students to pay attention and understand the material. She has all the math tips and tricks students are looking for.
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Sample Problems (8)
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Exponential Growth and Decay
Problem 1 5,424 viewsWhen Archeologists found King tuts tomb, they found a wooden stick that had 71% of its original carbon14 amount.
Using C14 dating and r = 0.00012 to figure out the age of the tomb. 
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Problem 2 3,986 viewsThe amount of a drug in ones blood decreases according to A(t) = 10e^{2t}, with t in hours.
a) How much remains after 2 hours?b) When will there be half the original amount? 
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a) initial amountb) How many after 10 months?c) How long to triple? 
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Problem 4 1,057 views 
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Problem 6 730 views 
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Problem 7 920 views 
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Problem 8 805 views
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