Answer:
The missing measurement is 124
Step-by-step explanation:
124 in
Perimeter Rectangle = 2(length + width)
856 = 2(304 + width)
856 = 608 + 2width
248 = 2width
124 = width
856 = 2(304+124)
856 = 2(428)
856 = 856
Correct
