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Alenkinab [10]
4 years ago
5

What is 5/4(a-8)=2/3

Geography
1 answer:
Softa [21]4 years ago
6 0
I believe a=128/15

I hope this helped a bit~
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Calculate the amount, in grams, of an original 300-gram sample of radioactive isotope Potassium-40 remaining after
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The current amount of the Potassium-40 sample is approximately 37.521 grams.

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The amount of the sample of the radioactive isotope decays exponentially in time, the amount of mass of the sample as a function of time (m (t)), in grams, is described below:

m(t) = m_{o}\cdot e^{-\frac{t}{\tau} } (1)

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\tau = \frac{1.3\times 10^{9}\,yr}{\ln 2}

\tau \approx 1.876\times 10^{9}\,yr

m = (300\,g)\cdot e^{-\frac{3.9\times 10^{9}\,yr}{1.876\times 10^{9}\,yr} }

m\approx  37.521\,g

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