3 years ago

Square root of 36 rounded to the nearest hundredth

Mathematics

1 answer:

Digiron [165]3 years ago

4 0

The square root of 36 is 6.00. I know this because six squared (6*6) is 36.

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Thorium -228 is a radioactive substance that decays 50% every 1.9 years. How much of a 50 gram sample will exist after 22.8 year

Evgesh-ka [11]

Answer:

$A=0.0122\ gr$

Step-by-step explanation:

The exponential decrease formula that we must use is:

$A=A_0e^ {-kt}$

Where A is the amount of thorium as a function of time

$A_0$ is the initial amount and k is the decrease rate

We know that initially there are 50 gr and that you decay 50% every 1.9 years.

$A=A_0*0.5=50*0.5 = 25\\\\t=1.9$

$25=50e^ {-k(1.9)}$

We solve the equation for k

$0.5=e^ {-k(1.9)}$

$ln(0.5)=ln(e^ {-k(1.9)})$

$ln(0.5)=-k(1.9)$

$-1.9k=ln(0.5)$

$k=-\frac{ln(0.5)}{1.9}\\\\k=0.3648$

After 22.8 years the amount of thorium that exists is:

$A=50e^ {-0.3648(22.8)}$

$A=0.0122\ gr$

5 0

4 years ago

63 is 45%of what number

swat32

63 is 45% of the number 140

6 0

4 years ago

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9/10 of alien races think invading Earth is a bad idea.

yulyashka [42]

90 % because it is 9/10

6 0

3 years ago

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25/32 divided by (-5/6)

Vlad [161]

25 / 32 ÷ ( -5/6)

=(25/32) (6/−5)

=(25)(6) / (32)(−5)

=150 / −160

=−15/16

(Decimal: -0.9375)

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4 years ago

Ruben is buying bricks for a project. He knows that 5 bricks weigh 26 pounds. He wants

Nostrana [21]

Answer:

The weight of 24 bricks is 124.8 theoretical probability pounds

Step-by-step explanation:

26/5=5.2

24x5.2=124.8

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3 years ago

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