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A gold coin appreciated in value from $100 to $238 in eight years. Find the average annual rate of appreciation. 8. Ten years ago Michael paid $250 for a rare 1823 stamp. Its current value is $1000. Find the average annual rate of growth. 9. A used car valued at $12,000 decreased in value to $4900 in 5 years. Find the annual rate of depreciation. 10. A certain radioactive element decays over time according to the equation  EMBED Equation.DSMT4 where A= the number of grams present initially and t=time in years. If 1000 grams were present initially a) how many grams are present after 900 years? How long will it take for there to be 100 grams remaining? 11. Bacteria in a culture are growing exponentially with time according to the table shown. Bacteria Growth HourBacteria06011202240 a) Write an equation to model the number or bacteria present at any time t. b) How may bacteria a there after 8 hours? c) How long will it take for there to be 100,000 bacteria present? ANSWERS: 1. a) $1120 b) $1404.93 2. a) $1418.52 b) $1425.76 c) $1433.24 3. a) $10,000 b) $6400 4. a) $3150 b) $1220.37 5. 9.01 or 9 years 6. 18.9 or 19 years 7. 11.4% 8. 14.9% 9. 16.4% 10. a) 125 grams b) 996.6 or 997 years 11. a)  EMBED Equation.DSMT4  b) 15,360 bacteria c) 10.7 or 11 hours   + GH4567UVhjkh hECJj h CJEHUj(M h CJUVh 6>*CJ h@CJh 5CJ\jh CJEHUj)M h UVjh CJU h8v[CJ hKuYCJ h CJ  -. M N   Z [ ' : ; 2 3  "%iwkdl$$Ifl0ZR 6#064 la$$#&#$/Ifa$ ^` %&(,uu$$#&#$/Ifa$wkd$$Ifl0ZR 6#064 la,-/3uu$$#&#$/Ifa$wkd$$Ifl0ZR 6#064 la34  cdefg $a$wkdd$$Ifl0ZR 6#064 laghijk90P&P/ =!"#$% DplDd 4J  C A? 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