At t=2 and t=11 the population appears to be 143. I hope this helps.
In plain English, the question asks: find the time or times when the population is 143.
A national park records data regarding the total fox population F over a 12 month period, where t = 0 means January 1, t = 1 means February 1, and so on. Below is the table of values they recorded:
t, month 0 1 2 3 4 5 6 7 8 9 10 11
F, foxes 150 143 125 100 75 57 50 57 75 100 125 143
Let g(t) = F denote the fox population in month t . Find all solution(s) to the equation g(t) = 143 . If there is more than one solution, give your answer as a comma separated list of numbers.