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a ) U = 29 500 ( 0. 75)t d ) v = 29 300 (1:25)+ 5) U= 29 560 (0.25)t C ) U = 2 9 50 ( 1 - 75 ) * In a Science experiment , the number of bacteria is recorded every minute . The number of bacteria can be modelled by the exponential function 4= 10 (1.9 ) 12, where y represents the # of bacteria and ac represents # of minutes since the start of the experiment. The # of bacteria , to the nearest whole #, at the start of the experiment was a ) 19 b ) a c) 10 d ) 1 1