Radioactive decay of 40K atoms in an igneous rock has resulted in a ratio of 25 percent 40K atoms to 75 percent 40Ar and 40Ca atoms. <span>this rock </span>2.6 10^9 y years old. The answer is number 3. The rest of teh choices do not answer the question above.
Answer:
D
Explanation:
<em>I am an alt, and my main account will confirm it.</em>
<em>A: The U.S. government generally pursues the latter bottom-up approach by funding international organizations that help strengthen the bases for gradual democratic transition (the rule of law, accountable government institutions and expanded political competition) by offering technical assistance and training to political</em>
<em>B: If you are an American living abroad, this means that as a US citizen, you must file a US federal tax return and pay US taxes no matter where you live at that time. In other words, you are subject to the same rules regarding income taxation as people living stateside.</em>
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<em>C: Beyond their military and geostrategic virtues, alliances provide important political benefits that facilitate the use of American power both internationally and with respect to the domestic audience. The chief political advantage of alliances is enhanced international legitimacy.</em>
<em>Hope this helps you!</em>
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Answer:
the 8th one is true, I don't know about the other 2. Goodluck :)