The distance from A to B will be negative when the line is trending downward from left to right.
Percent is parts out of 100 so
45%=45/100=9/20
'of' means multiply
18 =9/20 times something
multiply both sides by 20/9 to clear fraction
360/9=something
40=something
the value is 40
I believe the answer is 60 degrees I am a little confused by that question though