Okay, here we have this:
Considering the provided number line, we are going to identify where is point C in number line, so we obtain the following:
We can see that between 0 and -1 there are 8 lines and that point C is in the sixth, therefore we have:
C=-6/8 or -0.75
Finally we obtain that the point C is at -6/8 or -0.75.