1. What is the simplified form of the expression $i^{-2}$? ___
2. Which of the following is equivalent to the expression $i^{-6}$?
3. Simplify the expression $i^{-11}$ to its simplest form. ___
4. The expression $i^{-7}$ is equivalent to which of the following?
5. What is the value of $i^{-10}$? ___
6. Express the expression $\sqrt{-144}$ in terms of the imaginary unit $i$. The result is ___.
7. Which of the following expressions is equivalent to $\sqrt{-23}$?
8. Simplify the expression $\sqrt{-72}$ and write it in terms of $i$. Your answer should be ___.
9. By definition, the imaginary unit $i$ is the number whose square is -1. What is the value of $i^2$?
10. Write the expression $\sqrt{-50}$ in its simplest form in terms of $i$. The answer is ___.