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MA_775_DIABLO [31]
2 years ago
15

Will give brainliest

Mathematics
1 answer:
Galina-37 [17]2 years ago
7 0

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

#SPJ1

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It should be A= 1/2bh but im not sure why you wrote those extra things. Are we supposed to use them?

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Which set of ordered pairs represents a function?
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3 years ago
Find the value of n so that the expression is a perfect square trinomial and then factor the trinomial.
Anna007 [38]

The correct expression is (a) n = 100; (x + 10)^2

<h3>How to determine the value of n?</h3>

The expression is given as:

x^2 + 20x + n

Take the coefficient of x

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Divide by 2

k/2= 10

Square both sides

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The above value represents the value of n

i.e.

n = 100

So, we have:

x^2 + 20x + 100

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Factorize

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Factor out x + 10

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Hence, the correct expression is (a) n = 100; (x + 10)^2

Read more about trinomial at:

brainly.com/question/1538726

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