A substance decays from 200 grams to 50 grams in 4 years. What is the decay rate?
Solve for r using .
Let's solve for the decay rate using the formula for exponential decay:
where:
is the amount remaining at time ,
is the initial amount,
is the decay rate,
is the time.
We are given:
The initial amount grams,
The amount after 4 years is grams,
The time years.
Substitute these values into the equation:
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