Question 1199030
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Half-life Formula
y = a*(0.5)^(x/H)


We have:
a = 20 = starting amount in ounces
H = 8.5 = half-life in hours
x = 24 = number of hours
y = number of ounces left after x hours


So,
y = a*(0.5)^(x/H)
y = 20*(0.5)^(24/8.5)
y = 2.82528945857332
y = 2.83
After a full 24 hours, there should be about 2.83 ounces of material remaining.


It appears there might be some rounding error either on my part, or perhaps your teacher made a typo somewhere. 


The closest value to this is <font color=red>D) 2.82 ounces</font> which is likely the final answer.
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