Ben Jealous in Germantown on Oct.14. (Astrid Riecken/For The Washington Post)

Perhaps in an attempt to be "mathy," the Oct. 30 editorial "Chevy Chase populism in Maryland" described Democratic gubernatorial candidate Ben Jealous's free-tuition proposal as "exponentially costlier" than similar plans. "Exponentially" is an adverb that describes the way something grows, not the way it is.

Joan Reinthaler, Washington