tolong pake caranya ya

16. 2/5×20×12=96
17.v=phi×r×r×t
=22/7×14×14×25
=15400
18.3/8×24000=9000
19.A (2,-2)
B (-3,-4)
20.C (-2,4)
D (-5,-3)
21.2 4/5=2,8
22.4/7 ×2800=1600