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4 years ago

In a school there are 60 teachers and 1200 students. 30% of students are bilingual

2 answers:

6 0

First, you need to find out what 15% of 60 is. So you do 60×0.15 and that is 9. Then you do 1200×0.3, and that is 360. So, you add both of the final mini answers, and you get 369 people are bilingual

Lera25 [3.4K]4 years ago

5 0

The are 369 altogether. 360 students and 9 teachers.

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The radioactive element americium-241 has a half-life of 432 years. How many years will it take a 10 gram mass of americium-241

geniusboy [140]

<h2>Answer: 816 years</h2>

This problem can be solved using the Radioactive Half Life Formula:

$A=A_{o}.2^{\frac{-t}{h}}$ (1)

Where:

$A=2.7g$ is the final amount of the material

$A_{o}=10g$ is the initial amount of the material

$t$ is the time elapsed (the quantity we are asked to find)

$h=432y$ is the half life of americium-241

Knowing this, let's find $t$ from (1):

$2.7g=(10g).2^{\frac{-t}{432y}}$

$\frac{2.7g}{10g}=2^{\frac{-t}{432y}}$

$0.27g=2^{\frac{-t}{432y}}$

Applying natural logarithm in both sides:

$ln(0.27g)=ln(2^{\frac{-t}{432y}})$

$-1.309=-\frac{t}{432y}ln(2)$

$-t=\frac{(-1.309)(432y)}{0.693}$

Finally:

$t=816y$

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