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6. BC/ED = AB/AD
BC/8 = 9/6
BC.6 = 8.9
6BC = 72
BC = 72/6 = 12 cm (B)

7. QT = √RT²-QR²
QT = √5²-3²
QT = √25-9
QT = √16 = 4 cm

PS/QT = RS/QR
PS/4 = 3/3
PS.3 = 4.3
3PS = 12
PS = 12/3 = 4 cm (A)