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Intermediate Algebra – Student Workbook – Second Edition 2013

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Lesson 3b <strong>–</strong> More Exponential Functions<br />

Practice Problems<br />

4. For each exponential function, identify the Initial Value and the Growth/Decay Rate. First<br />

one is done for you.<br />

a) f(x) = 1000(0.98) x b) g(x) = 3200(1.32) x<br />

Initial Value = 1000<br />

Decay Rate = 2%<br />

c) p(t) = 50(0.75) t d) f(x) = 120(1.23) x<br />

e) A(r) = 1000(1.075) r f) g(x) = 1200(0.35) x<br />

5. Determine the Doubling Time or Half Life for each of the following. Write the appropriate<br />

equation and then use your calculator to solve. Round your answer to two decimal places.<br />

a) y = 200(1.2) t b) f(x) = 200(0.8) x<br />

c) y = 1500(1.5) t d) p(t) = 3000(1.45) t<br />

e) f(x) = 3000(0.99) x f) p(t) = 25000(0.80) t<br />

Scottsdale Community College Page 134 <strong>Intermediate</strong> <strong>Algebra</strong>

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