Answer:
FG = 66
Explanation:
the opposite sides of a parallelogram are congruent , then
FG = EH and HG = EF , so
2z - 28 = z ( subtract z from both sides )
z - 28 = 0 ( add 28 to both sides )
z = 28
Then
EH = 4z - 46 = 4(28) - 46 = 112 - 46 = 66
thus
FG = EH = 66