Asample of a compound made up of various elements totals 90 ounces. if the total amount of lead in the compound weighs 23 ounces, what percentage of the compound is made up of lead? if necessary, round your answer to the nearest hundredth of a percent. a) 0.26% b) 3.91% c)74.44% d)25.56%

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?