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## Homework Statement

At a seaport, the depth of the water

*h*metres at time

*t*hours during a certain day is given by this formula:

Q: What is the maximum depth of the water? When does it occur?

## Homework Equations

h = 1.8 sin 2pi [(t - 4)/12.4] + 3.1

## The Attempt at a Solution

4.9 = 1.8sin 2pi [(t-4)/12.4] + 3.1

1.8sin2pi = 0

4.9 - 3.1 = (t-4)/12.4

1.8 = (t-4)/12.4

1.8 x 12.4 = t - 4

22.32 + 4 = t

26.32 = t

That answer is wrong even when i convert from 24 hour clock to the 12 hour clock.

The correct answer is 7:06a.m and 7:30a.m

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