Not Sure about What Exactly Question is Asking and Desired Answer Format

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I don't think I have too much trouble understanding the book or material, but I am not sure what they are actually asking and their desired answers. Here are my understanding for questions below:

Exercise 1.3
(a): Show that a misclassified weight will result in a negative correlation?
(b) and (c): Show that a data could train the function in the correct direction?

Excercise 1.7
Evaluate whether the target functions (a) to (d) will be the correct target function?

Problem 1.2
I have no idea how w = [w0, w1, w2] could be visualized to a graph.