A tsunami is approaching the San Francisco Bay! The water first goes down from its normal
level, then rises to an equal distance above its
normal level, and finally returns to its normal
level after 20 seconds. The normal depth of
water at San Francisco Bay is 15 meters. The
maximum level of the water in the tsunami is
26 meters. Write a sinusoidal function that
represents the level of the water over time.
Explain how you find each parameter.

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Step-by-step explanation:

you never say the total so we cant find the percentage used for petrol

step-by-step explanation:

the required function is .

step-by-step explanation:

from the given table it is noticed that the graph passing through (-3,7), (0,4), (3,1) and (8,-4).

it is a linear function because the value of y is decrease by one as the value of x increase by 1.

the slope of the function is

the slope of the function is -1 and the y-intercept is 4.

the slope intercept form is

where, m is slope and b is y-intercept.

therefore the required function is . the graph of this function is shown below.