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2 years ago

How many liters of a 10% alcohol solution must be mixed with 40 liters of a 50% alcohol

Mathematics

1 answer:

inn [45]2 years ago

5 0

Answer:

13 $\frac{1}{3}$

Step-by-step explanation:

$20+.1x=.4\left(40+x\right)$

x=40/3 = 13 $\frac{1}{3}$

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The half-life of Radium-226 is 1590 years. If a sample contains 200 mg, how many mg will remain after 1000 years?

adell [148]

Answer: 129.33 g

Step-by-step explanation:

$$$Let $p=A \cdot e^{n t}$ \\$(p=$ present amount, $A=$ initial amount, $n=$ decay rate, $t=$ time)$

$\begin{aligned}&\Rightarrow \text { Given } p=\frac{A}{2} \ a t \ t=1590 \\&\Rightarrow \frac{1}{2}=e^{1590n} \Rightarrow n=\frac{\ln (1 / 2)}{1590}=-0.00043594162\end{aligned}$

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2 years ago

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Stolb23 [73]

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3 years ago

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Answer:

Step-by-step explanation:

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