## Precalculus (6th Edition)

$d(Q, S)=13$
RECALL: The distance between the points Q and R on a number line, whose coordinates are q and r, respectively, is given by the formula: $d(Q, R) = |q-r| \text{ or } d(Q, R) = |r-q|$ Use the formula above, with $q = -1$ and $s=12$, to obtain: $d(Q, S) \\=|12-(-1)| \\=|12+1| \\=|13| \\=13$
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