Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_28744929_1 (joined_acc VARCHAR, location VARCHAR)
### Question:
when did the institution at chapel hill, North carolina join acc?
### Answer:
SELECT joined_acc FROM table_28744929_1 WHERE location = "Chapel Hill, North Carolina"