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**dvmasaka** The population of native cats in a large regional forest is modelled by the formula P=t^3**-35t**+275t+875 for 0 ≤ t ≤ 28, where t is the time in years after January 1980.

a) find the initial population of native cats in the forest

b) Use your calculator or other wise, to find the population when it was at its lowest level, and state the year in which this occurred.

Please help...

All I need for question b) is the equation of the graph because the equation mentioned in the question does not work for some reason.... (to graph the function using my graphing calculator)