## Precalculus (6th Edition)

$d(P, R)=12$
RECALL: The distance between the points P and R on a number line, whose coordinates are p and r, respectively, is given by the formula: $d(P, R) = |p-r| \text{ or } d(P, R) = |r-p|$ Use the formula above to obtain: $d(P, R) \\=|8-(-4)| \\=|8+4| \\=|12| \\=12$