How did the invention of the astrolabe vasco da gama make his voyage to india?

a )it allowed him to navigate the seas using the sun and stars.

b) it allowed him to create a map to other sailors return to asia

c) it allowed him to use the winds to return from longer journeys.

d) it allowed him to scare off anyone who would try to attack his ship.

How were the european systems of mercantilism and capitalism similar during the 18th and 19th century

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.

Can someone me write a paragraph on this topic i feel confused