Why did pope leo III proclaim charlemagne to be emperor of the romans

In 1912, the imperial system that had ruled over china for thousands of years

Complete the square for 3x2 - 12x = 9.

7. how did the early egyptians use the flooding of the nile river to their advantage? they diverted the water to flood their enemy's lands and destroy their crops. they created an easier way to travel to the mediterranean sea and the indian ocean. they established a new water-based athletic event for the ancient olympics in greece. they devised an innovative irrigation system, which created a surplus of food.