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3 years ago

Which of these statements is true about the U.S. system of checks and balances?

Social Studies

1 answer:

forsale [732]3 years ago

7 0

I believe the last answer because decisions are run through all 3 branch’s before being made official.

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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>

8 0

3 years ago

Should we worry about extinction? Why?

Eddi Din [679]

You wanna die? Talk about why you don’t want to die.

6 0

3 years ago

Read 2 more answers

Whats the peoples from attak on taitns full names?

Ulleksa [173]

Eren Yeager , Mikasa Ackerman , <span>Armin Arlert</span>

5 0

3 years ago

The colonists were upset with British taxes because they had no representation in

natali 33 [55]

I think it’s the answer is A because Colonial assemblies denounced the law claiming the tax was illegal on the grounds that they had no representation in Parliament.

4 0

3 years ago

Characteristics frequently associated with nonvoters include which of the following?

serious [3.7K]

Answer:

c. Low education, low income, and being relatively young.

Explanation:

The people with lower literacy rates were mostly unaware of the value of their vote and their citizenship rights. They lacked faith in the voting system and see it as a system of just pretending to secure their rights. Young age and lack of patience drive them towards other methods to change their socio-economic conditions while some consider that irrespective of what they choose it would not change their life anyhow.

7 0

3 years ago