After calculating the items produced in 3, 4, 5, and 6 hours, two statements are true: 4,500 items are made every 4 hours, and 5,625 items are made every 5 hours.
The manufacturing company makes 1,125 items every hour. To find out how many items are made in multiple hours, you would multiply the number of items made in one hour by the number of hours.
3,255 items in 3 hours: 1,125 items/hour * 3 hours = 3,375 items (This statement is incorrect)
4,500 items in 4 hours: 1,125 items/hour * 4 hours = 4,500 items (This statement is true)
5,625 items in 5 hours: 1,125 items/hour * 5 hours = 5,625 items (This statement is true)
6,725 items in 6 hours: 1,125 items/hour * 6 hours = 6,750 items (This statement is incorrect)
Therefore, the correct statements are that 4,500 items are made every 4 hours, and 5,625 items are made every 5 hours.