## Precalculus (6th Edition)

$d(P, Q)=3$
RECALL: The distance between the points P and Q on a number line, whose coordinates are p and q, respectively, is given by the formula: $d(P, Q) = |p-q| \text{ or } d(P, Q) = |q-p|$ Use the formula above to obtain: $d(P, Q) \\= |-1-(-4)| \\= |-1+4| \\= |-3| \\= 3$