Answer:
XZ = 16.25 cm
QR = 6.8 cm
Explanation:
A) Taking the proportion of similar sides
=>

Cross Multiplying
=> 7.2 XZ = 18*6.5
=> XZ = 117/7.2
=> XZ = 16.25 cm
B) Taking proportion of similar sides
=>

Cross Multiplying
=> 18 QR = 17*7.2
=> QR = 122.4/18
=> QR = 6.8 cm