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# Alg2 lesson 10-6

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### Alg2 lesson 10-6

1. 1. Exponential Growth occurs when a quantity increases by a fixed percent each time period.<br />Models for exponential growth:<br />a is the initial amount<br />r or k is the percent of increase in decimal form<br />t is the time in years<br />
2. 2. Exponential Decay occurs when a quantity decreases by a fixed percent each time period.<br />Models for exponential decay:<br />a is the initial amount<br />r or k is the percent of decrease in decimal form<br />t is the time in years<br />
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17. 17. The half-life of Sodium-22 is 2.6 years.What is the value of k for Sodium-22?<br />
18. 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?<br />Answer: It was formed about 8.6 years ago.<br />