MAT_1143-mar_28 - Click to edit Master subtitle style...

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Unformatted text preview: Click to edit Master subtitle style March 28, 2011 Sections 5.6 (and a bit of review of 5.5) Exam 3 • Exam 3 should be Wednesday, April 20 (still 3 weeks away) • It will cover 4.7, 5.1-5.6, 6.1-6.5 • We still have lots more to cover on our use of exponential functions. Review of some of our Topics from Before Spring Break Y=4*1.3x A-Growth B-Decay Growth Factor? A. 4 B. 30% C. 1.3 D. 130% Growth Rate? A. 4 B. 30% C. 1.3 D. 130% Remember: growth factor = 1 + growth rate OR Growth rate = growth factor – 1 (how far from 1 is Y=2*0.8x A-Growth B-Decay Decay Factor? A. 20% B. 80% C. 0.80 D. 2 Decay Rate? A. 20% B. 80% C. 0.80 D. 2 Remember: decay factor = 1 - decay rate OR Decay rate = 1- decay factor (how far from 1 is the If we are told we have a decay rate of 15% and an intial value of 20, our equation would be: A. 20*0.15t B. 20*1.15t C. 20*0.85t D. 15*0.20t Examples of Exponential Growth and Decay • Section 5.6 gives MANY examples beyond some of the ones we’ve already seen. • Radioactive decay – Often given the half-life, say 30 years – So, in 30 years, half of the substance decays – S=C*ax in general and .5C=C*a30 (equation at one half-life) – Solve for a, the ANNUAL growth factor as before •...
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MAT_1143-mar_28 - Click to edit Master subtitle style...

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