Earth's slowing rotation and Moons drift

I have been wondering about this question for a long time. I know that when the Earth formed a day on Earth was about six hours long and the moon was a mere 40,000 miles away from Earth, but what I want to know is how far does the moon move away from the Earth every year and by how much does the Earth’s rotation slow down by every year? Are these values constant or is their a pattern? What I mean is if the moon let’s say moves an inch a year away from the Earth will it continue to move an inch way for the next 50 billion years (Even though the Earth and the Sun won’t be here, but lets just do this theoretically speaking). Or could the moon move away from the Earth 1 inch this year and 0.5 or two inches the next year etc.? I want to know if the Earth’s slowing rotation and the moons drift away from the Earth have been occuring at a constant rate for the last 4.53 billion years or if it is now occuring faster or slower than before, and if this rate will speed up or slow down in the future. Does anyone know a formula for this? Also I know that the moon will be out of the Earth’s gravity in approximately 50 billion years. At that time one day will be approximately equal to 48 of our current days so a person who is celebrating their first birthday will be 48 years old according to our current time. Anyways my question was how far (miles or lightseconds) will the moon be from the Earth in 50 billion years? Please give suggestions. Thank You.