SOLUTION: Please help me solve this equation. A herd of deer is introduced onto a small island. At first the herd increases rapidly, but eventually food resources dwindle and the populatio

Question 845157: Please help me solve this equation.
A herd of deer is introduced onto a small island. At first the herd increases rapidly, but eventually food resources dwindle and the population declines. It can be shown by means of calculus that the rate R (in deer per year) at which the deer population changes at time t is given by R = −4t3 + 26t.
(a) When does the population cease to grow? (Round your answer to two decimal places.)
after t = years
(b) Determine the positive values of t for which R > 0. (Enter your answer using interval notation.)
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!

Here's the plot:

What are the values of for which ?

and

The population stops growing ( )
when years
-------------------------
The population growth is positive between
and years
Disregard all the negative time on plot
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