1. The problem statement, all variables and given/known data For real numbers x(1), x(2), ..., x(n), prove that |x(1) + x(2) +...+x(n)| <= |x(1)|+...|(n)| 2. Relevant equations 3. The attempt at a solution Maybe begin with prooving that x <= |x| ? Im not sure how to do this though. Any help or hints would be great, as im really stuck on this.