The 3rd one! they invested heavily in the sugar and tobacco industries in cuba
Old world was so much nicer back then :D
Answer:
Explanation:
A mathematical problem is a problem that is amenable to being represented, analyzed, and possibly solved, with the methods of mathematics. This can be a real-world problem, such as computing the orbits of the planets in the solar system, or a problem of a more abstract nature, such as Hilbert's problems