According to your total calories in and out, will you gain weight, lose weight or maintain your weight over time? Why? If you will gain or lose weight, how long will it take you to gain or lose one pound of body fat?

If it’s above your maintence cals then you’ll gain and if it’s at maintence then you stay the same weight if it’s under you’ll lose weight
Because your body needs a certain amount of cals to be able function properly and the maintence cals are just the right amount of Cala your body needs to just be at a maintence.
You will lose if you are about 500-1000 Cals below your maintence cals you should lose one pound of fat in 1 -2 weeks
If you eat about 350 Cals above your maintence cals then you would gain an extra pound about every 10 days.