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Example Question #3451 : Algebra Ii
An element has a half life of 6 days. What is the approximate amount remaining for a 50 mg sample of this element after 5 days?
Possible Answers:
Correct answer:
Explanation:
Write the formula for half life.
Since the time requested is five out of the six day of the half life, the value of
is:
Substitute all the known values into the equation.
The answer is:
Example Question #791 : Mathematical Relationships And Basic Graphs
The number of butterflies in an exhibit is decreasing at an exponential rate of decay. The number of butterflies is decreasing by
every year. There are butterflies in the exhibit right now. How many butterflies will be in the exhibit in years?
Possible Answers:
Correct answer:
Explanation:
Because the butterflies are decreasing exponentially, we can use this equation
is the final value
is the original value
The decay for this problem is 5% or 0.05
The period of time is 7 years
Using this equation we can solve for
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