Final answer:
The Roman numeral MCLXV is equivalent to the Arabic numeral 1165. By adding the values of individual numerals, we get the sum of 1000 + 100 + 50 + 10 + 5, which equals 1165.
Step-by-step explanation:
The Roman numeral MCLXV represents the number in Arabic numerals as 1165. To convert, you add the values of each letter: M is 1000, C is 100, L is 50, X is 10, and V is 5. When a smaller numeral follows a larger one, you add it to the total, and when a smaller numeral precedes a larger one, you subtract it. Since all numerals after M ('1000') are smaller and none of them is followed by a larger numeral we simply add their values: 1000 (M) + 100 (C) + 50 (L) + 10 (X) + 5 (V) = 1165.