The height of the water in feet.e.e at a boat dock t hours after 7am is given is the time measured in seconds. Find the period
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When the time t is measured in hours the period T is when cos(85t) again has the same value for t+T, where T is the period.

Let t=0 (7am) then cos(85t)=1. The next time cos(85t) is equal to 1 is when 85T=2π=6.2632. So T=2π/85=0.07392 hours approx. Converted into seconds this period is 4.4352 seconds approx.

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