2.
Smiling through the pain:
3.
The case of the mysterious ruler:
7.
The natural progression:
10.
Trying to get those points any way you can:
12.
Getting OUT of there:
15.
Going to the next question:
16.
Getting those good grades:
17.
Some good ol'-fashioned rounding:
18.
The only time math is useful:
19.
And, of course, your future: