Answers

2016-07-27T23:13:40+08:00
An=a(1)r^n-1 a(1)=2 r=3 n=8 2(3)^8-1 2(3)^7 (2) 2187 an=4374
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2016-07-28T15:27:16+08:00
This is a geometric sequence problem  with      r  = 2  &   a  = N
   number of terms   =   24/3 + 1    =   9
     thus
                nth  =   arⁿ-¹
                       =  N 2⁹-¹   
                       =  N 2⁸   =    256N

        The number of bacteria in 24 hrs   =   256N
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