Please explain how the solution became this

The product of two consecutive positive odd integers is 399. The two integers are and Enter the smaller integer in the first box.

Please show step-by-step solution

Please solve this ASAP

Please check if there is more than one solution so I can see how to do it.

A company is planning to manufacture snowboards. The fixed costs are $136 per day and the total costs are $7,427 per daily output of 25 boards. What is the average costs per board tend to as production increases?

Please solve the last 3 problems, I just submitted and have solution to the first 3 problems .

Mr. O'Dell and Mr. Johnson begin running laps around a one mile track at the same time. Mr. O'Dell completes a mile every 6 minutes and Mr. Johnson completes a mile every 8 minutes. How long will it take for them both to finish a lap at the same time?

could you do this on a piece of paper so that its easier to understand?

Solve this question by formulas only no excel or any software. please and thank you