Answer: D . 
Step-by-step explanation:
Given : Jenny studied the characteristics of two species of bacteria. The number of bacteria of species A, A(t), after t hours is represented by the function,

The number of bacteria of species B, B(t), after t hours is represented by the function, 
Then, the difference in the number of bacteria, N(t), of both the species after t hours will be :-

Hence, the correct answer should be : D . 
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Range = { 12 , 4 , -6 }
Thus the correct answer is (( A )) .
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2.6 is the aswer.
Why?take the 2 number after the decimal the estimate
Answer:
the number to the right of the 7
Step-by-step explanation: