1
A 20th = 1/20 = 0.05 So 0.0520 = 9.537*10-27 approx.
Yes, on the eve of the 20th century, the US, along with Japan and Italy, emerged as great world powers. The 20th century was from January 1, 1901 to December 31, 2000.
The units digit of 9n is 9 if n is odd and 1 if n is even. So 1.
104,857,600,000,000,000,000,000,000
Yes, Power Rangers will have a 20th anniversary. Power Rangers' 20th anniversary is officially on August 28, 2013 and the current 2013 season of Power Rangers Megaforce is considered to be their 20th anniversary season even though the anniversary aspects won't be shown until the 2nd half of Megaforce which will be called Super Megaforce.
520 = 95,367,431,640,625.
7.97922663x10^16
1.520 = 3325.25673007965087890625
1.5
20th century
Twenty.