Jawabanmu

2014-01-28T17:14:27+07:00
N = f . t
n = 5 . (3×60)
n = 5 . 180
n = 900

maaf jika jawaban saya kurang tepat
2014-01-28T17:16:18+07:00
F = 5 Hz
t = 3menit = 180detik

n = F x t
   = 5 x 180 = 900
1 5 1