Bantuinnnnnnnnn...........

1) ³log 15 - ³log 10 + ³log 36 - ³log 6
= ³log (15 ÷ 10 × 36 ÷ 6)
= ³log 9
= ³log 3²
= 2 . ³log 3
= 2

2) ³log 2000 = ³log (5×5×5×4×4)
= ³log 5 + ³log 5 + ³log 5 + ³log 4 + ³log 4
= b + b + b + a + a
= 3b + 2a

3) ²log 12 + ²log 4 - ²log 36 + ²log 6
= ²log (12×4÷36×6)
= ²log 8
= ²log 2³
= 3 . ²log 2
= 3