The function f(t) = 4 cos(pi over 3t) + 15 represents the tide in bright sea. it has a maximum of 19 feet when time (t) is 0 and a minimum of 11 feet. the sea repeats this cycle every 6 hours. after five hours, how high is the tide? 13.5 feet 16 feet 18.5 feet 17 feet

17 ft

Step-by-step explanation:

I don't think you meant to put pi over 3t ... I think you meant to put pi just over 3

Just plug in 5 assuming t is time in hours.  

Evaluate 4 *cos(pi/3 *5)+15

which is  17 ft

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step-by-step explanation:

thats not a system of equations, that is a solution