Mathematics, 26.09.2019 09:00 hernandezana360
5.–/1 points scalcet8 3.8.011. ask your teacher my notes question part points submissions used scientist can determine the age of ancient objects by a method called radiocarbon dating. the bombardment of the upper atmosphere by cosmic rays converts nitrogen to a radioactive isotope of carbon, 14c, with a half-life of about 5730 years. vegetation absorbs carbon dioxide through the atmosphere and animal life assimilates 14c through food chains. when a plant or animal dies, it stops replacing its carbon and the amount of 14c begins to decrease through radioactive decay. therefore, the level of radioactivity must also decay exponentially. a parchment fragment was discovered that had about 74% as much 14c radioactivity as does plant material on earth today. estimate the age of the parchment. (round your answer to the nearest hundred years.) yr
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Mathematics, 21.06.2019 16:30
The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?
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Mathematics, 21.06.2019 16:30
An airport in death valley is 60 feet below sea level, and an airplane is flying 2,000 feet above sea level. how many feet must the plane descend in order to land? a. 2060 b. 2000 feet c. 1940 feet d. 1880 feet e.1400 feet will mark as brainliest
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Mathematics, 21.06.2019 19:00
How can you tell when x and y are not directly proportional?
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Mathematics, 21.06.2019 19:30
Liz had 140 pens and inna had 100 pens. after inna gave liz some pens, liz had 3 times as many pens as inna. how many pens did inna give liz?
Answers: 2
5.–/1 points scalcet8 3.8.011. ask your teacher my notes question part points submissions used scien...
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