Given the coordinates (7,−3) , (7,−8) , (11,−4) , and (11,−9) , what is the length of the vertical sides of the quadrilateral, in cm?(

The length of the vertical sides can be found by subtracting the y-coordinates of the points.

For the first vertical side:
|-8 - (-3)| = |-5| = 5 cm

For the second vertical side:
|-9 - (-4)| = |-5| = 5 cm

Therefore, the length of the vertical sides of the quadrilateral is 5 cm.