Alg2 lesson 10-6

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Alg2 lesson 10-6

  1. 1. Exponential Growth occurs when a quantityincreases by a fixed percent each time period. Models for exponential growth:a is the initial amountr or k is the percent of increase in decimal formt is the time
  2. 2. Exponential Decay occurs when a quantitydecreases by a fixed percent each time period. Models for exponential decay:a is the initial amountr or k is the percent of decrease in decimal formt is the time
  3. 3. The half-life of Sodium-22 is 2.6 years.What is the value of k for Sodium-22?
  4. 4. A geologist examining a meteorite estimates that itcontains only about 10% as much Sodium-22 as itwould have contained when it reached the surface ofthe Earth. How long ago did the meteorite reach thesurface of the Earth? Answer: It was formed about 9 years ago.

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