Write the following intervals in set builder form.
(i) [2,7]
(ii) [-9, 4)
(iii) `(-oo, -1]`

Explanation

To convert the given intervals into set-builder form, we will follow a systematic approach for each interval.

### Step-by-Step Solution:

**(i) Interval: [2, 7]**

1. Identify the endpoints: The interval includes both endpoints, 2 and 7.
2. Write the set-builder notation: Since both endpoints are included, we can express this as:
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