9. [0/1 Points] DETAILS PREVIOUS ANSWERS SWOKPRECALC13 6.2.077. MY NOTES ASK YOUR TEACHER | PRACTICE ANOTHER A tidal wave of height 50 feet and period 6 minutes is approaching a sea wall that is 12.5 feet above sea level (see the figure). From a particular point on shore, the distance y from sea level to the top of the wave is given by 7r y = 25 cos _t, 3 with t in minutes. For approximately how many minutes of each 6-minute period is the top of the wave above the level of the top of the sea wall? :lx Shown in the figure is a graph of y = %x + sin x for 27r s x s 27r. Using calculus, it can be shown that the x-coordinates of the turning points A, B, C, and D on the graph are solutions of the equation % + cos X = 0. Determine the coordinates of these points. A (x.y)=( ) B (X. Y) =( ) C (w) ( ) ( ) D (le)=