The length PQ of the given parallelogram PSQR is determined as 9 cm.
Opposite sides of a parallelogram are parallel (congruent).
PQ = RS
2x+5 = 4x+1
2x-4x = 1-5
-2x = -4
x = -4/-2
x = 2
PQ = 2x+5
PQ = 2(2)+5
PQ = 4+5
PQ = 9cm
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