The distance between two points, a and b, on a number line is expressed as
la – bl. where a and b are rational numbers.
Think about locating a point halfway
between a and b on a number line. How can you
find the coordinate for such a point? Develop a
formula in terms of a and b that you can use to
find the coordinate. Your formula must work for
positive and negative values of a and b. Does
absolute value play a role in your formula? Why
or why not? Under what circumstances might
your formula be used in the real world? Explain