Pre calc question regarding modeling sinusidal functions

Question

Ocean tides can be modeled by a sinusoidal function. Suppose that there is a low and high tide every 12 hours, and that high tide in Seattle occurs at 1:00 a.m. and 1:00 p.m. with the low tides 6 hours after high tides. Also suppose that the water level at high tide is 10 ft above the water level at low tide.a.  Find a formula for the function y=h(t) that computes the height of the tide above low tide at time . (In other words,  corresponds to low tide.)b.  What is the height of the tide at 11:00 a.m.?

Answer 1