Chapter R - Review of Basic Concepts - R.2 Real Numbers and Their Properties - R.2 Exercises - Page 22: 115

Difference between scores $=19$ Absolute value of difference $=19$ The absolute value indicates that there are 19 strokes between their scores.

Jordan Spieth score $= -18$ Zach Johnson score $=1$ Difference between scores $= 1-(-18) = 19$ The absolute value of this difference is $|19| = 19$ The absolute value indicates that there are 19 strokes between their scores.