### Concept (1)

Exponential decay refers to an amount of substance decreasing exponentially. Exponential decay is a type of exponential function where instead of having a variable in the base of the function, it is in the exponent. Exponential decay and exponential growth are used in carbon dating and other real-life applications.

### Sample Problems (8)

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The 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?
###### Problem 2
How to use exponential decay to find the amount of drug left in somebody's blood stream.
###### Problem 4
Determining after how many years a product will be worth a certain amount.
###### Problem 5
How to use exponential decay to predict how much an item will be worth after a certain amount of time
###### Problem 6
Predict population size after a certain amount of time.
###### Problem 7
How to predict the age of a fossil with a known decay constant and exponential decay modeling.
###### Problem 8
Application of Newton's Law of Cooling to show how long it takes an item to cool.