There are 16 bactiria in a beaker and four hours later there are 228 bacteria in the beaker. what is the rate of change per hour in the number of bactiria

Write and solve the appropriate exponential equation:

228 = 16(r)^4, where r is the change per hour in the number of bacteria:

228

= r^4     =   14.25.  

 16

Taking the fourth root of both sides, we get:  r = 1.94 (answer)

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