Consider the pattern at right.

1. Continue the pattern to find $\frac { 1 } { 2 ^ { - 1 } } , \frac { 1 } { 2 ^ { - 2 } } , \frac { 1 } { 2 ^ { - 3 } }$, and $\frac { 1 } { 2 ^ { - 4 } }$.

   Answer (a):

   $2, 4, 8, 16$

2. What is the value of $\frac { 1 } { 2 ^ { - n } }$?

   Answer (b):

   $2^{n}$

3. Write a conjecture about how to rewrite $\frac { 1 } { a ^ { - n } }$ without a negative exponent.

   Hint (c):

   Use the same reasoning as in part (b).