I need help #7 The tide at a boat dock can be modeled by the equation y = -2 cos ( +8, +8, where tis the number of hours past noon and y is the height of the tide, in feet. For how many hours between $ = 0 and I = 12 is the tide at least 7 feet? [The use of the grid is optional) ​

Will mark determine whether the conjecture is true or false. give a counterexample for any false conjecture. given: points r, s, and t conjecture: r, s, and t are coplanar. a) false; the points do not have to be in a straight line. b) true c) false; the points to not have to form right angles. d) false; one point may not be between the other two.