Respuesta :

Number one is 0
Number two is 11/2 or 5.5
Number three is undefined
discipulus

Answer:

[tex] \frac{3 - 3}{20 - 19} = \frac{0}{1} = 0 = m \\ \frac{ - 4 - 7}{ - 6 - ( - 4)} = \frac{ - 11}{ - 2} = \frac{11}{2} = m \\ \frac{8 - ( - 13)}{17 - 17} = \frac{21}{0} = und[/tex]