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Katen [24]
3 years ago
5

What numbr must be subtracted from -20 to obtain 15?

Mathematics
1 answer:
Radda [10]3 years ago
8 0

Answer:

-5

Step-by-step explanation:

-5--20

=-5+20

=20-5

=15

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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.

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