Mathematics, 25.09.2019 01:00, Kzamor

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 : )

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