c)[tex] \frac{19}{17} [/tex] + [tex] \frac{15}{17} [/tex]=[tex] \frac{34}{17} [/tex]
[tex] \frac{23}{9} + \frac{2}{9} = \frac{21}{9}
[/tex]
d)[tex] \frac{9}{25} + \frac{11}{25} = \frac{20}{25} [/tex]
[tex] \frac{87}{100} - \frac{7}{100} [/tex]=[tex] \frac{80}{100} [/tex]