Answer:
The answer is 4 hours.
Explanation:
The next one is d. (Bottom right)
Answer: the answer is 4
when looking for the half life, it says to look for when the initial amount is half of what it used to be, because it is 100, 100 divided by 2 is 50, and when looking at the hours (x value) for 50 it says 4.
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