Write an expression that is equivalent to 123x + x + 2x

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

Michael is training for a marathon. in his first week he plans to run 8miles. what path should he take

Using inductive reasoning, what are the next two number in this set? 2,3/2,4/3,5/4,