I don't understand a single thing on how to get an answer. you know how to answer it?

Answer:
6³
Step-by-step explanation:
6^-1 . 6^-4 . 6^8
6^-1 × 6^-4 × 6^8
applying multiplicative law of indices
6^-1 + ^-4 + ^8
(note: -1 + -4 + 8 = -1 - 4 + 8 = -5 + 8 = 3 )
So,
6^3
6³