Homework Help: algebra

Posted by Anonymous on Tuesday, April 3, 2012 at 3:38pm.

carbon 14 has a hlf life of 5700 years. scientists use this fact to determine the age of things made up of organic material. Suppose the average page of a book containing approximitly .5 mg og carbon 14 was put into a time capsule. How much carbon14 will each page contain after each of the following of years? a. 5700 b. 11400 c. 22800 d. 34200

algebra - Steve, Tuesday, April 3, 2012 at 5:15pm
If a(t) is the amount of C14 after t years,

a(t) = .05 * 2^(-t/5700)

do you see why this works? every 5700 years, the exponent of t decreases by 1, from 0 to -1 to -2, etc. making the multiplier 1, 1/2, 1/4, ...

a(5700) = .05*2^(-1) = .025
a(11400) = .05*2^(-2) = .0125
and so on
algebra - Morgan Freeman, Thursday, May 10, 2012 at 1:00pm
ME SO HORNY.

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