Final answer:
The sentence requires a comma before the coordinating conjunction 'yet' to separate the two independent clauses correctly.
Step-by-step explanation:
The sentence in question, "Josue woke up with a raspy cough yet he still came to school.", is missing a comma before the coordinating conjunction 'yet' which is used to connect two independent clauses. The correct sentence should be: "Josue woke up with a raspy cough, yet he still came to school." This correction follows the rule of using commas with coordinating conjunctions. Commas are important in separating elements and clarifying the meaning of sentences.