To represent the constraint on the total number of pieces of furniture (chairs and tables) that can be shipped each day, you can write the following inequality:
\[ t + c \leq 19 \]
In this inequality:
- \( t \) represents the number of tables sold.
- \( c \) represents the number of chairs sold.
The inequality states that the sum of the number of tables and chairs sold must be less than or equal to 19, which reflects the maximum shipping capacity of the store.