Scientists are conducting trials on a new disinfectant for use in hospitals and doctor’s offices. After conducting several trials, they found that it decreases the presence of bacteria by 35% each second that it is applied to a surface. The next trial will apply it on a desk surface with approximately 20,000 cells of bacteria on it.
Which logarithmic function models the time, , in seconds, it will take the number of cells to decrease to a value of n?
A.
B.
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D.