Pls!
1) place a second set of parenthesis in the expression below so that the value of the expression is -15
5-20 \div (-5) times 2-7
2) jon makes pillow covers. each pillow cover uses 3/4 yard of fabric. how many complete pillow covers can he make from 7 1/8 yards of fabric?
3) carmella has a length of 24 feet of wallpaper border. she wants to put the border around the walls of a room with dimensions of 61 3/4 inches and 74 1/8 inches. estimate how much of the border she needs. does she have enough of the border?
pls explain! you very much : )

Aking and his army will attempt to capture a fortress. the left and right flanks break off from the main group to attack the west and east guard towers. suppose the left flank has a 60% chance of success and the right flank has a 75% chance of success, independently of one another. if both flanks capture their respective targets, then the king has a 98% chance of successfully taking the fort. if, however, only the left flank captures its tower, the king has an 80% chance of success; if only the right flank succeeds, the king has a 50% chance. if both flanks fail, then the king's chance of capturing the fort drops to 20%. it turns out the king captures the fort. what is the probability that one, and only one, flank was successful (either the left, or the right, but not both)? (round your answer to 3 decimal places)