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3 years ago

I'm confused on what to do since I day dream during class, I know it's a bad thing but I have a hard time paying attention

Mathematics

1 answer:

vagabundo [1.1K]3 years ago

4 0

Answer:17/20 answer a

Step-by-step explanation:

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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:

$t=816y$

3 0

3 years ago

1/3 of the fish in the tank are snappers. 2/9 of the fish are catfish and the rest are goldfish. There are 40 goldfish in the ta

Paraphin [41]

Find fraction of snappers and catfish:

1/3 + 2/9 = 3/9 + 2/9 = 5/9

Find fraction of goldfish:

1 - 5/9 = 4/9

4/9 = 40 goldfish

1/9 = 40 ÷ 4 = 10

9/9 = 10 x 9 = 90

Answer: 90 fish in the tank

3 0

3 years ago

Read 2 more answers

PLEASE HELP! ! ! urgent!

sertanlavr [38]

Answer:

$6(\frac{1}{3} \times\frac{7}{5} )=(6\times\frac{1}{3} )\frac{7}{5}$

$Answer: B$

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Hope it helps...

Have a great day!!

8 0

3 years ago

What two numbers add to +5 and have a product of -3?

Tasya [4]

They don't come out even.
As rounded decimals, the two numbers are

5.54138... and -0.54138...

6 0

3 years ago

Neil says his favorite number is 19 units from Sasha's favorite number on the number line. What are the two possibilities for Ne

Ivahew [28]

His favorite number could be either 0 or 38.

8 0

3 years ago

Read 2 more answers

I'm confused on what to do since I day dream during class, I know it's a bad thing but I have a hard time paying attention​

I'm confused on what to do since I day dream during class, I know it's a bad thing but I have a hard time paying attention