i dont accept there are units.

for air the basis of refraction = 1

Answers :Like all indexes (or indices), it is unitless. It is a ratio, like all indexes. In this case it's i = v/c; area v is ablaze acceleration < c in a average and c is ablaze acceleration in a vacuum. As they are both speeds (v and c), the units abolish out in the ratio.

log abject of 2 4x=5
3 log x - log 2x= 2
2 log abject of 3 x= 54

Please explain in detal how to break these; I tried, but I deceit accept this :(