I think the answer is A because it I'm right it did double the size.
You could move the decimal to the right 6 times
0.2 x 10^6
0200000 or 200,000(remember that if there's only two digits there will be one less zero than the exponent)
Yes it determine the length
The answer is 1
factors of 25 are 25, 5, 1
factors for 77 are 77, 11, 7, 1
