Question

If A is at (−2,−8)

and B is at (1,1) , what are the coordinates of point C ?

Answer 1

I don't have an answer for you, but I do have an important hint ... one that will
stand you in good stead as you go further in your mathematical studies:

The reason there's a drawing right next to this question in the book or on the
homework sheet is that the question can't be answered without the drawing.