Evaluate [(30+6)-3^2] ÷ by 9·2
2 answers:
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Answer:
Step-by-step explanation:
As it is a fluctuating scenario, where the value repeats itself after some time, it must be represented by periodic function.
As the value at the beginning is a non zero value, we should use a Cosine function.
The general cosine function is,
where,
a = amplitude of motion,
p = period ,
b = vertical displacement.
The water level at high tide was 9 feet and 1 foot at low tide. So,
The next high tide is exactly 12 hours later. So period or p = 12
Putting all the values,