1. Exponential Growth occurs when a quantity increases by a fixed percent each time period. Models for exponential growth: a is the initial amount r or k is the percent of increase in decimal form t is the time in years
2. Exponential Decay occurs when a quantity decreases by a fixed percent each time period. Models for exponential decay: a is the initial amount r or k is the percent of decrease in decimal form t is the time in years
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17. The half-life of Sodium-22 is 2.6 years.What is the value of k for Sodium-22?
18. A geologist examining a meteorite estimates that it contains only about 10% as much Sodium-22 as it would have contained when it reached the surface of the Earth. How long ago did the meteorite reach the surface of the Earth? Answer: It was formed about 8.6 years ago.
