3 years ago

PLEASE ANSWER ASAP I AM GIVING 30 POINTS!!! just answer which ones it is.

Mathematics

1 answer:

djverab [1.8K]3 years ago

7 0

So either a and d or a and c :)

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Suppose you buy a CD for $400 that earns 2.5% APR and is compounded quarterly. The CD matures in 5 years. Assume that if funds a

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The withdrawal fee will not take the compund rate, so, you should apply the usual formula for not compound rate, 
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3 years ago

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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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3 years ago

Help. Look at image. I don't get this.

Nadusha1986 [10]

Answer:

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Step-by-step explanation:

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Step-by-step explanation:

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4 years ago

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