Compound Sentences

In a compound sentence, the comma comes ______________ the coordinating conjunction.

What sentence structure is created when you join two independent clauses with a comma and coordinating conjunction?

Does this sentence need a comma?
I wanted to go to the store but I decided to stay home instead.

Does this sentence need a comma?
Should I go to the mall or movies?

Does this sentence need a comma?
She said you were in shock but I think you're just lazy.

Does this sentence need a comma?
I wanted to go to the store but I decided to stay home instead.

Does this sentence need a comma?
I went to dance and then went home.

Does this sentence need a comma? "She said you were sick but I think you're just lazy."

Complete the sentence with the coordinating conjunction that makes sense.
Andy plays the violin well, _____ the trumpet is his favorite instrument.
Options: so, but, yet, for