Answer:
the correct answer would be d.
29.2 divided by .86= about 34
Answer: The following triangles are congruent.
6.665 grams of the 13 grams remain after 8 hours.
<h3>How much of a 13 gram sample of iron-52 would remain after 8 hours?</h3>
The decay equation for the 13 grams of iron-52 is:

Where N is the amount of iron-52, and t is the time in years.
Where we used the fact that the half-life is exactly 8.3 hours.
Now, the amount that is left is given by N(8h), so we just need to replace the variable t by by 8 hours, so we get:

So 6.665 grams of the 13 grams remain after 8 hours.
If you want to learn more about half-life:
brainly.com/question/11152793
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Answer:
72 grams
Step-by-step explanation:
If one marshmallow weighs 7.2 all you have to do is take that times 10, which would give you 72 grams as the answer.