What helped the Mongol leaders maintain communication over long distances during the height of the Pax Mongolia

Horses and advanced transportation systems

Explanation:

There aren't specific choices for this question but I know that the Mongols used fast war horses to travel long distances and win wars. they also had an advanced road system.

d. japan's attack on pearl harbor

part a. there were 250 teenagers surveyed (100% of tenagers = 250)therefore 1 % = 250/100 = 2.5 76% = 1% x 76 = 2.5 x 76 = 190 teenagers of the 250 surveyed liked burgerspart b: jane surveyed 25% (which is equal to 50 teenagers, i.e. a quarter of the teenagers surveyed is 50) to get 100% we simply get 4 quarters, i.e. multiply 50 by 4 = 200 teenagers were surveyed by jane. part c: it is impossible to give an example where a percentage is greater than 100%, since, by definition , percentage means "per 100".