Final answer:
To find the difference in daily production levels between plant A and plant B, subtract the daily production level of plant B from the daily production level of plant A.
Step-by-step explanation:
To find the difference in daily production levels between plant A and plant B, we need to subtract the daily production level of plant B from the daily production level of plant A.
Plant A daily production: 7x + 15
Plant B daily production: 2x - 8
Difference in daily production: (7x + 15) - (2x - 8) = 5x + 23
Therefore, plant A produces 5x + 23 more items than plant B.