Jim runs 10 yards, then turns 180 degrees and runs 10 more yards. After repeating the turn and run two more times, he ends up 25 yards away from where he started. How?

Answerthe simplified expression isexplanationthe given expression is,let us deal with the bracket first.the two negatives in the parenthesis will become positive.the expression now becomes,we now expand the parenthesis to get,we group like terms to obtain,this simplifies to,