Find the Distance Between Two Points Given Their Coordinates $R$ And $S$

Multiple Choice

Find the distance between two points given their coordinates.
-Find the distance between points $R$ and $S$ on a number line, with coordinates 7 and $- 4$ , respectively.

A) $d ( R , S ) = 11$
B) $d ( R , S ) = - 11$
C) $\mathrm { d } ( \mathrm { R } , \mathrm { S } ) = 3$
D) $\mathrm { d } ( \mathrm { R } , \mathrm { S } ) = - 3$