What were some of the challenges the climbers of mount Denali or Everest's faced? How did they overcome those challenges

People keep spending additional units of a particular resource on a want until their marginal benefit is  decreasing withgreater thanless thannot affected by  their marginal cost.

Triangle xyz is translated 4 units up and 3 units left to yield triangle x'y'z' what is the distance between any two corresponding points on triangle xyz and trianglex'y'z' ?

Less developed nations have low literacy rates. true or false