The rabbit population on a small island is observed to be given by the function
P(t) = 130t − 0.4t4 + 1200
where t is the time (in months) since observations of the island began.
(a) When is the maximum population attained (Round your answer to one decimal place.)

What is the maximum population? (Round your answer to the nearest whole number.)

(b) When does the rabbit population disappear from the island? (Round your answer to one decimal place.)

Question

The rabbit population on a small island is observed to be given by the function
P(t) = 130t − 0.4t4 + 1200
where t is the time (in months) since observations of the island began.
(a) When is the maximum population attained (Round your answer to one decimal place.)

What is the maximum population? (Round your answer to the nearest whole number.)

(b) When does the rabbit population disappear from the island? (Round your answer to one decimal place.)

anonymous · Answer

some typo here i think.  you wrote 
$$P(t)=130t-.4t4+1200$$

anonymous · Answer

oh sorry i missed that. it is supposed to be -.4t^4