At midnight, at high tide, the depth of water on a beach is 7 feet. Six and one-half hours later, the depth of the water at low tide is 3 feet. Assume that the depth of the water varies sinusoidally with time. Let t represent the number of hours since midnight. a. The amplitude is ?
b. The period is ?
C. The phase shift is ?
d. The midline is y ?

What is the depth of the water att = 4 hours?

Can some one me with these questions

Graph the system of inequalities presented here on your own paper, then use your graph to answer the following questions: y < 4x − 8 y is greater than or equal to negative 5 over 2 times x plus 5 part a: describe the graph of the system, including shading and the types of lines graphed. provide a description of the solution area. (6 points) part b: is the point (5, −8) included in the solution area for the system? justify your answer mathematically. (4 points)

What is fraction that is equivalent to 3/8