Answer:
Distrubutative property
Step-by-step explanation:
Grouping similar factors together makes this easier:
(8)(2)(10^7)(10^6) = 16(10^13) = 1.6(10^14)
I think it is no , one looks skinner than the other

so.... since the number after .81 is 1, it doesn't really round up to .82, so is just that, 15.81.
I am not sure if you wrote a repeating decimal with the line next to the 0.025 so comment if you need it. If it wasn't repeating it would be simply 1/40 if there is no repeating and you only want 0.025 is a fraction in simplest form.