The rabbit population on a small island is observed to be given by the function

p(t) = 140t − 0.3t4 + 1000

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.)

.

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

months.