Answer:
Step-by-step explanation:
If PQRS is parallelogram, then SP = RQ. Therefore we have the equation:
5z + 3 = 6z - 3 subtract 3 from both sides
5z = 6z - 3 subtract 6z from both sides
-z = - 3 change the signs
z = 3
QR = 6z - 3
Put the value of z to the expression:
QR = 6(3) - 3 = 18 - 3 = 15
