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Mrrafil [7]
3 years ago
8

What was the role of reformers in American life? a. to arrest political bosses b. to organize immigrants into labor unions c. to

take photographs of social abuses d. to point out social ills and help solve them
Social Studies
1 answer:
mash [69]3 years ago
7 0
It seems like d is the only possibility :) 
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What was murphy's law?
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As part of the fastest growing type of tourism activity, more and more tourists attend the opera or ballet performances at their
Roman55 [17]

Answer:

Cultural tourism

Explanation:

According to sociology, there are different ways in which people do tourism. One of these types of tourism is the cultural tourism

Cultural tourism refers to the tourism that a traveler does when they engage with the lifestyle of the people from the areas they visit, the art, history, and everything that has to do with the culture of the area.

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7 0
2 years ago
Suppose you find a rock that contains 10 micrograms of radioactive potassium-40, which has a half-life of 1.25 billion years. By
attashe74 [19]

Answer:

The rock is 3.75 billion years ago.

Explanation:

Given that:

Half life = 1.25 billion years

1 billion years = 10⁹ years

So,

Half life = 1.25 × 10⁹ years

t_{1/2}=\frac {ln\ 2}{k}

Where, k is rate constant

So,  

k=\frac {ln\ 2}{t_{1/2}}

k=\frac {ln\ 2}{1.25\times 10^9}\ year^{-1}

The rate constant, k = 5.5452 × 10⁻¹⁰ years⁻¹

Initial amount [A₀] = 80 micrograms

Final amount [A_t] = 10 micrograms

Using integrated rate law for first order kinetics as:

[A_t]=[A_0]e^{-kt}

So,  

10=80\times e^{-5.5452\times 10^{-10}\times t}

80e^{-5.5452\times \:10^{-10}x}=10

\frac{80e^{-5.5452\times \:10^{-10}x}}{80}=\frac{10}{80}

\ln \left(e^{-5.5452\times \:10^{-10}x}\right)=\ln \left(\frac{1}{8}\right)

x=\frac{10^{10}\times \:3\ln \left(2\right)}{5.5452}=3.75\times 10^9

So,

<u>The rock is 3.75 billion years ago.</u>

8 0
3 years ago
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