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1 year ago

Were the Native Americans who lived here primitive or civilized. Make sure you type in complete sentences,

Social Studies

1 answer:

omeli [17]1 year ago

6 0

Answer:

Native Americans were civilized

Explanation:

It refers to five Native American nations—the Cherokee, Chickasaw, Choctaw, Creek (Muscogee), and Seminole. These are the first five tribes that European Americans generally considered to be "civilized". Also the term "Five Civilized Tribes" they used this word in the mid 19th century

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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>

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2 years ago

Define "atmosphere" in your own words.

alexandr402 [8]

Answer:

def 1- The feeling of your surroundings

def 2- Gasses surrounding planets

Explanation:

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2 years ago

Wind energy is a clean and renewable source of energy. What other advantage of wind energy is shown in the picture?

Natasha2012 [34]

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2 years ago

Explain how economists use the term “guns or butter¨

allochka39001 [22]

Guns and butter generally refers to the dynamics involved in a federal government's allocations to defense versus social programs when deciding on a budget. Both areas can be critically important to a nation's economy. Times of war can have a substantial effect on a country's economy and its societal progression.

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2 years ago

What is a reason the war in Iraq is considered a controversy?

Irina-Kira [14]

Answer:

Explanation:

The Iraq War is considered a controversy because it was based on the argument that Iraq was stockpiling WMDs. However, when American-led coalition forces invaded no WMDs were found.

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2 years ago