
David W. answered 01/04/19
Experienced Prof
Final - Initial = Difference
1 - (-5) = 1 + 5 = 6 degree increase (that is, +6)
Note that the difference between 1 degree and (-5) degrees is (-6) (that is, 6 degree decrease).
In each case, the absolute difference | ( b - a } | is 6 (with no sign) degrees.