3 years ago

How about this one −p+

Mathematics

1 answer:

Bond [772]3 years ago

5 0

Answer:

NaNx10^-23

Step-by-step explanation:

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it bbbbbbbbbbbbbbb yeah b or d

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What is 4/5×24/12 equal to and simplified

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3 years ago

Use the exponential decay model, Upper A equals Upper A 0 e Superscript kt, to solve the following. The half-life of a certai

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Answer:

It will take 7 years ( approx )

Step-by-step explanation:

Given equation that shows the amount of the substance after t years,

$A=A_0 e^{kt}$

Where,

$A_0$ = Initial amount of the substance,

If the half life of the substance is 19 years,

Then if t = 19, amount of the substance = $\frac{A_0}{2}$ ,

i.e.

$\frac{A_0}{2}=A_0 e^{19k}$

$\frac{1}{2} = e^{19k}$

$0.5 = e^{19k}$

Taking ln both sides,

$\ln(0.5) = \ln(e^{19k})$

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Then $A=78\% \text{ of }A_0 =\frac{78A_0}{100}=0.78 A_0$

$0.78 A_0=A_0 e^{-0.03648t}$

$0.78 = e^{-0.03648t}$

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$\ln(0.78) = -0.03648t$

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Hence, approximately the substance would be 78% of its initial value after 7 years.

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3 years ago