Final answer:
The first plant produces 4x + 28 more items daily than the second plant.
Step-by-step explanation:
The first plant produces 8x + 16 items daily, while the second plant produces 4x - 12 items daily. To find how many more items the first plant produces than the second plant, we need to subtract the second plant's production from the first plant's production:
(8x + 16) - (4x - 12) = 8x + 16 - 4x + 12 = 4x + 28
Therefore, the first plant produces 4x + 28 more items daily than the second plant.