Question 1027604
log 30 means 10^X=30.

X = 1.477

Think about this - 

10^1 =10

10^2=100

now, 10^.5 is the square root of 10 or 3.162

So 10^1.5=31.62

It makes sense that it takes a bit lower, 1.477 so 10^1.477=30