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 : )

Kevin has a spinner that has 10 equal sections and 2 sections of each color—red, blue, green, yellow, and purple. kevin spins the spinner 180 times. kevin determines about how many times the spinner will land on red or green, and his work is shown below. -kevin has the formula reversed; it should be the total number of sections over the number of red or green sections. -kevin should have used a 4 in the numerator because there are 2 red sections and 2 green sections. -kevin should multiply by the number of sections in the spinner rather than the total number of spins. -kevin calculated the prediction correctly and did not make any mistakes.