Jonas Jenkins is the president elect.

1. Jonas Jenkins is the president-elect.

2. We found twenty-nine errors in the document.

3. My father has the most up-to-date computer available.

4. Her time-worn excuses are getting old.

5. I anticipate thirty-six guests at the wedding.

6. Two-thirds of the class is home with the flu.

Explanation:

Hyphens are used to bring together compound words. These compound words may have been written separately or as a word. They can be used to combine compound numbers as in  thirty-six and twenty-nine. They can be used to bring together two adjectives acting as a single word as in time-worn.

They can be used as line breaks and in-between syllables. Hyphens ease understanding and pronunciation of compound words.

(the answer is d)

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