1. The absolute value of an integer is its distance from zero on the number line. What is the value of $|-18|$? The value is ___.
2. Two integers are opposites. If one of the integers is -23, what is the other integer?
3. The expression $-(-a)$ means the opposite of a negative number. Simplify the expression $-(-31)$ to find its value. The value is ___.
4. Which statement correctly compares the absolute values of the integer 15 and its opposite, -15?
5. On a number line, the opposite of a positive integer is a negative integer. What is the opposite of the integer 50? The opposite is ___.
6. Fill in the blank with the correct symbol ($<, =, >$) to compare the numbers: $-12$ ___ $3$.
7. Fill in the blank with the correct symbol ($<, =, >$) to compare the numbers: $-9$ ___ $-4$.
8. The statement $-6 > -11$ is true. What does this mean about their positions on a number line?
9. Which of the following statements correctly compares the numbers $-15$ and $-5$?
10. If number $x$ is to the left of number $y$ on the number line, which statement must be true?