Plz ! combine as indicated by the signs. write variables alphabetically in your answer. (x-y/x+y) - (x+y/x-y)

In the final round of trivia competition, contestants were asked to name as many states that begin with the letter m as they could in 15 seconds. the bar graph shows the number of states the contestants were able to name. how many contestants participated in the final round of the competition? a) 6 b) 8 c) 14 d) 20

Four congruent circular holes with a diameter of 2 in. were punches out of a piece of paper. what is the area of the paper that is left ? use 3.14 for pi

At noon a tank contained 10cm water. after several hours it contained 7cm of water. what is the percent decrease of water in the tank?