bantuin ya tolong pake cara

1. - sifat komutatif, cth : 1+2 = 2+1 = 3
    - sifat asosiatif , cth : 1+(2+3) = (1+2)+3 = 6
    - tertutup, cth = 3+2 = 5
    - unsur identitas = 8 + 0 = 8
2. - sifat komutatif , cth : 4x3 = 3x4 = 12
    - sifat asosiatif , cth : 2 x (3x4) = (2x3) x 4 = 24
    - sifat distributif, cth : 1 x (2+3) = (1x2) + (1x3) = 2+3 = 5
3. v = phi x r x r x t
       = 22/7 x 14 cm x 14 cm x 15 cm
       = 9240 cm^3
4. v = d x w
       = 48 liter/menit x 50 menit
       =  2400 liter 
5. v = 1/2 x La x t
       = 1/2 x 256 cm^2 x 35 cm
       = 4480 cm^3