[math-fun] function "image" v. function "range"

I noticed that the Khan Academy still uses the term "range" instead of "image" in order to describe the smallest (in terms of subsets) range for a function. The "image" of f(x)=x*x (where the domain of f(x) is R) is {x in R|x>=0}. The "range" of f(x) is any superset of the image, e.g., R itself. http://en.wikipedia.org/wiki/Image_%28mathematics%29 http://en.wikipedia.org/wiki/Range_%28mathematics%29 I assume that the Khan Academy teaches this usage for "range" because the standardized tests require it. However, I thought that this usage of "range" was hopelessly obsolete, even 50 years ago. Is this continuing usage of "range" instead of "image" an artifact of school budgets that still can't replace 50-year-old textbooks, or what?