Answer:
Distance between mall and library is 6.32 miles.
Explanation:
Coordinates of the door to the library is at (2, 4) and door to the mall is at (8, 4).
Since, distance between two points
and
is given by,
Distance =

By this formula,
Distance between (2, 4) and (8, 4) will be,
Distance =

=

=

= 6.32 miles