Exponential Functions: y, equals, a, b, to the power x y=ab x a, equals, starting value = , 20300 a=starting value = 20300 r, equals, rate = , 9, point, 5, percent, equals, 0, point, 0, 9, 5 r=rate = 9.5%=0.095 Exponential Decay: Exponential Decay: b, equals, 1, minus, r, equals, 1, minus, 0, point, 0, 9, 5, equals, 0, point, 9, 0, 5 b=1r=10.095=0.905 Write Exponential Function: Write Exponential Function: y, equals, 20300, left parenthesis, 0, point, 9, 0, 5, right parenthesis, to the power x y=20300(0.905) x Put it all together Plug in time for x: Plug in time for x: y, equals, 20300, left parenthesis, 0, point, 9, 0, 5, right parenthesis, start superscript, 11, end superscript y=20300(0.905) 11 y, equals, 6770, point, 6, 5, 0, 7, 0, 2, 9 y=6770.6507029 Evaluate y, approximately equals, 6770, point, 6, 5 y6770.65 round