Math

A company's sales are seasonal with the peak in mid-December and the lowest point in mid-June. The company makes $110000 in sales in December, and only $30000 in June.

A) Find a trigonometric function, s=f(t) , representing sales at time t months after mid-January.

40000 +cos(pi/6 +pi /6)+ 70000

B) What would you expect the sales to be for mid-April?

Expected April sales are $??. Round your answer to the nearest whole number.

C) Find the t -values for which s= 70000.

t = 14 ?

t = 2?

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