The least is 2000 and the greatest is 2005 so the difference is 5 because 2000+5=2005 !!! Hope its helpful
Domain is the numbers you can use
the n stands for the which term
like 1st term, 2nd term, 3rd term, etc
so it makes sense that n is the set of all natural numbers (also called the set of counting numbers)
The ordered pairs that are a solution to the equation y=4-2x are (0,4) and (-1,6)