Why did European explorers land in the Americas? a.
They wanted to establish a mercantile economic system
b.
They wanted to find gold and other precious metals and gems
c.
They believed they had reached India
d.
They were looking to conquer Native Americans

a . they wanted to establish. a mercantile economic system

in all honesty, it really hasn't. except that hitler killed himself.

offline recommendation systems option b

because recommendation systems produce a list of two ways

1. through collaborative filtering

or

2. through content-based filtering