The function f(t) = 5 cos(pi over 4 t) + 11 represents the tide in Dark Sea. It has a maximum of 16 feet when time (t) is 0 and a minimum of 6 feet. The sea repeats this cycle every 8 hours. After six hours, how high is the tide?

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I was thinking just plug in 6 for t, but that for whatever reason that's not working. Is t in hours?

so .. ummm

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