Which of the following is not a polynomial identity? A. (a^2 + b^2)(c^2 - d^2) = (ac - be)^2 + (ad + bc)

B. a^3 - b^3 = (a - b)(a^2 + ab +b^2)

C. a^2 - b^2 = (a + b)(a - b)

D. (a + b)^2 = a^2 + 2ab+ b^2

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?