assume that you walk all 3 of the following paths in direct succession. you start each path right where you completed the previous one: 10 yards due north (that is, 90 degrees north of an axis that points east), 20 yards due north-east (that is, 45 degrees north of an axis that points east) and then 30 yards at 30 degrees south-west (that is, 30 degrees south of an axis that points west). *** if you walk all these three paths, what is your final displacement?