Concentration of algae in water fluctuates over a span of 12 moths. This concentration is called M(t), and t represents time messured in months from January 1.st, one year. The largest value of M(t) is M(7) = 500 and the smallest value is M(1) = 100 Assume M(t) can be expressed like this: M (t) = Co + C cos " (t - to ) ) a) Deside Co, C, T and to from the information above b) During the year, when is M(t) = 400