Which number belongs in the space labeled X?

Roman X represents number 10.

Explanation:

Roman numerals have Latin letters and seven in total. The numbers are written down by combining these amounts. The contribution that a specific amount in a record of a name gives to its total value depends on its position relative to other quantities. So, on, for example, four units are represented by one symbol (IV), four tens by another (XL), and four hundred by a third (CD). Mark V has the meaning of five units in both VI and IV. The Romans did not develop a single general system for recording large numbers.

answer; utilitarian;

answer; protecting domestic national security; i believe this is correct,plz check first,good luck;