Find $(-1)^{-10} + (-1)^{-9} + (-1)^{-8} + \cdots + (-1)^9 + (-1)^{10}$.

(The dots $\cdots$ mean that there are 21 numbers being added, one for each integer from $-10$ to 10.)
Question:
Find $(-1)^{-10} + (-1)^{-9} + (-1)^{-8} + \cdots + (-1)^9 + (-1)^{10}$.

(The dots $\cdots$ mean that there are 21 numbers being added, one for each integer from $-10$ to 10.)
Answer:
Let's think step by step.

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Find $(-1)^{-10} + (-1)^{-9} + (-1)^{-8} + \cdots + (-1)^9 + (-1)^{10}$.

(The dots $\cdots$ mean that there are 21 numbers being added, one for each integer from $-10$ to 10.)
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