Point B is the midpoint of segment AC. If AC is At -4 and C is at 10 , what is the location of point B

Question

need help with geometry 

Answer 1

     A                 M                    C       

   -4                  3                   10          AC = 10-(-4) = 14

1/2(14)=7   -4+7=3   and 3=10

Answer 2

midpoint is at (-4 + 10) / 2

 

Where is that?