12.1GeometricProgressionsForFredGreenleaf’sQRTextbookCompiledbySamMarateck©20092Examplesofgeometricprogressions•Ageometricprogressionisasequenceofnumbersinwhichagivennumberisaconstantratio,let’ssaya,timesthepreviousnumber.Examples:•1,2,4,8,16,32,i.e.,An=aAn-1,A0=1,a=2•80,40,20,10,5,2.5,i.e.,A0=80,a=1/23Given:apopulationincreasesby5%eachyear.AssumethatA0=20,i.e.,thepopulationatyearzerois20...
