[tex]1.) \: \: \frac{ - 5 - - 7}{2} = \frac{ - 5 + 7}{2} = \frac{2}{2} = 1 \\ [/tex]
[tex]2.) \: \: \frac{6 - 15}{2} = \frac{ - 9}{2} = - \frac{9}{2} \: or \: - 4.5\\ [/tex]
[tex]3.) \: \: \frac{ - 11 - 5}{2} = \frac{ - 15}{2} = - \frac{15}{2} \: or \: - 7.5 \\ [/tex]
[tex]4.) \: \: \frac{21 - ( - 13)}{2} = \frac{21 + 13}{2} = \frac{34}{2} = 17 \\ [/tex]
[tex]5.) \: \: \frac{ - 12 - 28}{2} = \frac{ - 40}{2} = - 20 \\ [/tex]
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