If an appetizer is selected, the number of different meals is given by:
[tex]5\times7\times6\times4=840[/tex]
If soup is selected, the number of different meals is given by:
[tex]3\times7\times6\times4=504[/tex]
The total number of different meals is therefore:
840 + 504 = 1344
The answer is: 1344 different meals.