The percentage of the radioactive isotope left is 25.0000%.
<h3>What is the half life?</h3>
The half life of a radioactive isotope is the time that will elapse before only half of the number of original isotopes will remain.
Now;
We are told that;
Half life (t1/2) = 55 days
Time taken (t) = 115 days
Ratio of isotope remaining = N/No
Thus;
N/No = (1/2)^t/t1/2
N/No = (1/2)^115/55
N/No = (1/2)^2
N/No =1/4
Hence, the percentage = 1/4 * 100/1 = 25.0000%
Learn more about half life of an isotope:brainly.com/question/16387602
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Answer:
The surface area is A≈96ft²
Answer:
1, yes add one, 2, no, 3, yes, you add 10. 4, no, 5, yes, you add 2.
Step-by-step explanation:
1 add one, 3 add 10 5 add 2.
Your welcome :)
Since there is a right angle, you can use Pythagoras' Theorem:
So x = √(24² + 7²) = 25
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Answer:
25
