Final answer:
The sentence that combines the two sentences using a coordinating conjunction is: The twenty mile hike almost ruined Matt, yet once he ate dinner, he felt rejuvenated.
Step-by-step explanation:
The sentence that combines the two sentences using a coordinating conjunction is: The twenty mile hike almost ruined Matt, yet once he ate dinner, he felt rejuvenated. The coordinating conjunction 'yet' is used to show a contrast between the two clauses. In this case, it contrasts the negative effect of the hike on Matt with the positive effect of eating dinner.
Learn more about Coordinating conjunctions