The distance between two points, a and b, on a number line is expressed as |a – b|, 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. discuss how you can find the coordinate of a point located other fractional distances from a to b (or from b to a). for example, locate a point three-fourths of the distance from a to b. what kind of calculation is involved?