Any idea what they're asking for here?
Are they just asking for coordinates? If so how would I find the coordinates? My eyes are telling me point C is at (1.55,1.55) but how am I supposed to know for sure? I can hardly tell where's it at. I just know it's between 0 and 2 for both x and y. What's this question asking? What is C'?
What are the steps in solving problems like these?
Probably $C = (1..5, 1.5)$ and $C' = (3.5, 1.5)$ that means that $|CC'| = 2.0$. Now From the scale $f(C)= -10$ and $f(C') = -15$, then $$ f_x(C) \approx \frac{-15-(-10)}{2.0} = -5/2 = -2.5 $$