1.28 = 128 * 10^-2
128 * (1/10^2)
128 / 10^2
128 / 100
1.28
Because, it's literally the same thing mathematically if you worked it out. Though, as I'm sure you're aware, it's just a much shorter and cleaner way of writing out large or small numbers.
I think that it is 270. 5400/180 = 30 8100/30 = 270
Step-by-step explanation:
1. 
(chain rule)
2 
