tolong nomer 8,29 dan 30.pake cara..

28. v tabung= (22/7 x 0.7 x 0.7) x 20.5)
=1.54 x 20.5
=31.57 b.

29. 34/7 + 10/4 + 85/14
= 136/28 + 70/28 +170/28
376/28 = 13 12/28

30. (22/7 x 28 x 28 x 84) x 5/6)
=206976 x 5/6 =172480
206976 - 172480 = 34496 c.