semuanya wajib pake caranya

37.Total data 24 anak=24*10=240
Total data 16 anak= 16*12=192

Total ank=24+16=40
Total data=240+192=432

Rata2 40ank=432/40=10.8

38.
-8+4-2+1=-5

39.
a=729

U2=ar=243
=729r=243
r=243/729=1/3

U10=ar^9=729(1/3)9
=3^6(3^-1)9
=3^(6-9)
=3^-3
=1/27