tolong dijawap no 5,6,7 dan 10

5) √(256 × 324)
=√256 × √324
= 16 × 18
= 288

6) 1 jam + 18 menit + 120 dtk
= ( 1 × 60) + 18 + ( 120 ÷ 60)
= 60 + 18 + 2
= 80 mnt

7) pukul 02.30
jarum pjg = angka 6
jarum pendek antara angka 2 dan 3
= ( 3½ × 30° )
= 105°

10) V = 343 liter = 343.000 cm³
r = ³√343.000
r = 70 cm