Answer:
7/5 which is about one and a half, so answer C
Step-by-step explanation:
convert to /80 to add them properly
[tex]\frac{9}{10} - \frac38 + \frac 78 = \frac{72}{80} - \frac{30}{80} + \frac{70}{80} = \frac{112}{80} = \frac75[/tex]
