What is the pronunciation aid that determines the stress placed upon a syllable called?

Accent mark.

Explanation:

An Accent mark or Diacritical mark is a special sign used above a vowel to indicate stress in the pronunciation of the syllable it is located on. Although the English language doesn't not include such sign in its grammar rules, there are other languages like Spanish that make use of it in many of its words.

from the excerpt from the "the dark game" the reader can infer that folke cronholm was spying for the allied nations.

for this case, we must find the number of deaths per day of the year 2015, in automobile accidents, knowing that 32,400 people died.

knowing that the year 2015 had 365 days we have the following division:

where "x" represents the number of deaths per day.

rounding off we have:

approximately, 89 people per day died in 2015

answer:

89 people per day