2 years ago

3,108 + 5,468 6987 +907

Mathematics

2 answers:

Ierofanga [76]2 years ago

7 0

Answer:

54,691,002

Step-by-step explanation:

svetlana [45]2 years ago

5 0

Answer:16470

Step-by-step explanation: I don’t know if there all adding together cause there’s not much information

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When you calculate the number of permutations of n distinct objects taken r at a time, what are you counting?.

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The number of ordered arrangements of n objects taken r at a time.

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3 years ago

Kelli had $ 0.55 to buy a sandwich. Gustavo had $ 1.64. They decided to buy a snack together and share it. How much money do the

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3 years ago

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3 years ago

A sample of Iron-59 contains 50 mg. One hundred days later, the sample contains 10.75 mg. What is the half-life of iron-59, in d

exis [7]

Answer:

$t_{1/2}=45.09 d$

Step-by-step explanation:

We can use the decay equation:

$M=M_{0}e^{-\lambda t}$

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λ is the decay constant

But:

$\lambda = ln(2)/t_{1/2}$

t(1/2) is the half-life.

So, we can rewrite the initial equation:

$M=M_{0}e^{-\frac{ln(2)}{t_{1/2}}t}$

Now, we just need to solve it for t(1/2):

$ln(\frac{M}{M_{0}})=-\frac{ln(2)}{t_{1/2}}t$

$t_{1/2}=-\frac{ln(2)}{ln(\frac{M}{M_{0}})}t$

$t_{1/2}=-\frac{ln(2)}{ln(\frac{10.75}{50})}100$

$t_{1/2}=45.09 d$

I hope it helps you!

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3 years ago