Which statements are true regarding the development of trigonometry? check all that apply. ancient mathematicians used trigonometry to find angles of triangles. ancient mathematicians used trigonometry to track the position of the sun. tangent was the first trigonometric relationship used by mathematicians. cosine was the first trigonometric relationship used by mathematicians. sine was the first trigonometric relationship used by mathematicians.

70 points ! pls 2. given the following two sets of data what is the union of the two sets and what is the intersection of the two sets. set a = {1, 2, 3, 4, 5, 6, 7, 8, 9} set b = {2, 4, 6, 8, 10, 12, 14} 3. given a regular deck of cards. describe a way of pulling cards that would create a dependent event and then one that would create an independent event. 4. what is the probability of drawing a red card and then drawing a spade without replacing the card that was drawn first?

Use mathematical induction to prove the statement is true for all positive integers n, or show why it is false. 1^2 + 4^2 + 7^2 + + (3n - 2)^2 = [n(6n^2-3n-1)/2]

Marco states that 7.696696669…… is a rational number because it is a repeating decimal. is he correct? justify your answer.