Which sentence states a fact?

 - Computers make life better for people.
 - Bill Gates was a founder of Microsoft.
The first sentence states a fact.
Bill Gates was a founder of Microsoft.
It can be proved by reading about the history of Microsoft.
The second sentence states an opinion.
Computers make life better for people.
Better shows what a person believes, thinks, or feels. Another person might have a different opinion about what makes life better or worse.