1. On a number line, the opposite of the number $-15$ is ___.
2. What is the simplified value of the expression $-(-11)$?
3. Which statement is always true about a non-zero number and its opposite?
4. If a withdrawal of 40 dollars is represented by the number $-40$, its opposite, a deposit of 40 dollars, is represented by the number ___.
5. Calculate the value of the expression $-(-(-20))$. The result is ___.
6. To plot the integer $-8$ on a number line, how would you move from the starting point of $0$?
7. If you start at $0$ on a number line and move $11$ units to the right, you will be at the integer ___.
8. Which of the following statements about the number zero is correct?
9. Every integer has an opposite. The opposite of the integer $25$ is ___.
10. A submarine is at sea level, which is represented by the integer $0$. If it dives $100$ feet, which integer represents its new position?