Final answer:
To find out how many more items the 1st plant produces daily than the 2nd plant, subtract the daily production of the 2nd plant from the daily production of the 1st plant. The 1st plant produces 2x + 21 more items daily than the 2nd plant.
Step-by-step explanation:
To find out how many more items the 1st plant produces daily than the 2nd plant, we need to subtract the daily production of the 2nd plant from the daily production of the 1st plant.
The daily production of the 1st plant is given by the expression 5x + 17.
The daily production of the 2nd plant is given by the expression 3x - 4.
Therefore, the 1st plant produces 2x + 21 more items daily than the 2nd plant. So, the correct option is A) 2x + 21 items.