I need help asap pls

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line?

Liz is shipping a package to her friend.the maximum weight of a medium flat-rate box is 20 pounds,including the box which weighs 6 ounces.write and solve an inequality to describe the possible weight ,w, of the contents that liz will ship to her friend if she must use a medium flat-rate box.