If the coordinate of A is -3 and the coordinate of B is 0.5, what is line segment AB?

Answer 1

3.5

That's the distance from -3 to .5 on the real number line

Subtract one from the other, -3-0.5= -3.5 but take the absolute value because distances are positive

or you could subtract .5-(-3)=.5+3=3.5