Yeah. Lets see. Raul Castro is Fidel's brother and Che Guevara, an Argentinian doctor, was also a member of Fidel's 26th of July Movement that seized power in Cuba in 1959. Maybe somebody could really have this name, but in the context where it appears I would say this Mexican doctor is a...
Now I get to extend a mea culpa. I screwed up in the second half of my post.
The sum of the angles of any triangle is 180 degrees.
Start with the first angle and call it x. Valid integer values for x range from 1 to 178. (Yes, some of these triangles will look very bizarre.)
Call the...
eldad9 got the easiest way to do #2 by looking at it backwards. It makes the assumption that you are including 0 which will depend on whether the teacher was assuming positive or non-negative as you mentioned. #1 is a bit more involved. This should get you started though.
The sum of the...