1. The problem statement, all variables and given/known data The water depth in a harbor is 21m at high tide and 11m at low tide. Once cycle is completed every 12 hrs. (a) Find equation for the depth as a function of time. (b) Draw a graph for 48 hrs after low tide, which occurred at 14:00. (c) State the times where the water depth is (i) max (ii) min (iii) average value (d) estimate the depth of the water at (i) 17:00 (ii) 21:00 (e) (i) 14m (ii) 20m (iii) at least 18 m 2. Relevant equations 3. The attempt at a solution This question is really confusing me. I graphed it so that my y axis is (0,11) and went from there. Found the equation to be y= -5cos((π/6)x)=16 and I also got y = 5sin(π/6(x-3))+16, I check the solutions and they were correct. But now when I went to find the max, min, avg values I kept getting them wrong. For max solutions said 08:00 and 20:00 I got 6hrs and 18hrs for max and I don't understand how this correlates?? Same problem occurred for the min and avg. As for part (d) I put 17 into the equation and got 20.33 and then I put 21 into the equation and got 16 could someone verify if this is correct? I'm still working on (e).