What is the value associated with the prefix "deci"?

The prefix "deci" is a metric prefix that indicates a factor of one-tenth, or 0.1. In exponential form, this is represented as ( 10^{-1} ). Hence, the correct answer is ( 10^{-1} ).

In the metric system, each prefix denotes a power of ten that modifies the base unit it precedes. "Deci" specifically means that one unit of measurement is divided into ten equal parts. Therefore, if a unit such as a meter is described as one decimeter, it represents one-tenth of a meter. Understanding this prefix is essential for accurate measurement and conversion in fields such as science, engineering, and technology.

The other options (10^1, 10^2, and 10^3) correspond to different prefixes: "deca," "hecto," and "kilo," respectively, which represent factors of ten, one hundred, and one thousand.