Mathematics as a subject?

Which of the following is most likely the next step in the series? a3z, b6y, c9x, d12w, е15v, f18u

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?

Simplify the expression below -3(10x+4y)+6(6x-2y)