Jen and I met tonight and have a few questions we'd like your input on.

Question 42: we were wondering if the answer is C because the other possible answers, A and D, say "in direct proportion to", and that makes those answers wrong?  We're not sure exactly what that phrase is referring to.  Any insights welcome!!

Question 126: We are wondering specifically how B and C are ruled out, leaving D as the correct answer?

Question 112: Looking at the book, it's a little unclear about how B is the right answer and C is not.  We're re-read the definitions in Ch 2, but could use a little more help clarifying.