Question: When a bactericide is added to a nutrient broth in which bacteria are growing, the bacterium population continues to grow for a while, but then

When a bactericide is added to a nutrient broth in which bacteria are growing, the bacterium population continues to grow for a while, but then stops growing and begins to decline. The size of the population at time t (hours) is b equals 8 Superscript 5 Baseline plus 8 Superscript 4 Baseline t minus 8 cubed t squared .

b=85+84t83t2. Find the growth rates at t equals 0 hours comma

t=0hours, t equals 4 hours comma

t=4hours, and t equals 8 hours.

t=8hours.

The growth rate at tequals

=0 hours is

nothing

bacteria per hour.

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