Answer:
9861
Explanation:
The last clue indicates that the solution is 19*519 = 9861. This value also satisfies the other clues, that is, it has four digits, all digits are different, it begins and ends with an odd number (9 and 1) and has two even numbers in the middle (8 and 6).
Folk songs is not a material
Answer:
B. The new technologies would reduce positive checks on population.
Explanation:
Since there would be better and more efficient methods of farming that would reduce the positive checks that happen to the population. The positive checks would at first be a lot less impactful than before the technology. Disease and natural disasters would not cripple a population until it grows to a much larger number.
Answer:
His career illustrates the possibilities for diffusion and intermingling of cultures brought about by the Mongol conquests. hope this helps