Which prefix corresponds to a factor of 10^-1?

The prefix that corresponds to a factor of 10^-1 is "deci". In the metric system, the prefix "deci-" denotes one-tenth of a unit. Therefore, when you see "deci-" used in measurements, it indicates that the value is divided by ten. For example, one decimeter (dm) is equal to 0.1 meters, clearly demonstrating the relationship to the factor of 10^-1.

In contrast, the other prefixes represent different factors: "centi-" signifies a factor of 10^-2 (or one-hundredth), "milli-" indicates a factor of 10^-3 (or one-thousandth), and "micro-" refers to a factor of 10^-6 (or one-millionth). Each of these prefixes depicts progressively smaller fractions of a unit than "deci-," which only relates to one-tenth. Thus, "deci" is accurately identified as the prefix that corresponds to a factor of 10^-1.