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Snowcat [4.5K]
3 years ago
15

On September 17, 2008, high tide in Portland was at midnight. The water level at high tide was 10.3 feet; later, at low tide, it

was 0.3 feet. Assuming the next high tide is exactly at 12 noon and that the height of the water is given by a sine or cosine curve, find a formula for the water level in Portland as a function of time, where y is the water level in feet, and t is the time measured in hours from midnight.
Mathematics
1 answer:
____ [38]3 years ago
7 0
So the problem ask to calculate and formulate a function that could represent the water level in Portland if y is the water level and t is for time in hour so the possible answer would be that y=cosine(t)-0.3. I hope you are satisfied with my answer and feel free to ask for more
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Answer:

The answer to your question is below

Step-by-step explanation:

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I think your functions are wrong they must be       f(x) = 1/2x    f⁻¹(x) = 2x        

a)  f⁻¹(-2) = 2(-2)

             = -4

b) f(-4) = 1/2(-4)

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c) f(f⁻¹(x)) = 1/2(2x)

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  f(f⁻¹(-2)) = -2

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Step-by-step explanation:

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