PRE-LAB RUBRIC #1:

1.) (depends on the student)

2.) For all of these, I will be using emacs
2.a) emacs letter.txt
2.b) start typing
2.c) 
-backspace will delete character before cursor
-delete will delete a character after cursor, as will C-d
-C-k will delete everything on the same line past the cursor
-M-d will delete a word after cursor
-M-delete will delete a word before the cursor
2.d) C-x s
2.e) C-x C-w
2.f) C-x C-c

3.) Any explanation that partially captures the regular expression:
"^[a-zA-Z_][a-zA-Z0-9_]*$"
2moo // can't start with a number
something^invalid // can't contain the special character '^'

4.) 
-3.5e2
1.4e-2
-140.0
0.0025

5.) (incorrectly listed as 6 on the lab) Characters are mapped between integers between 0 and 255, inclusive (technically only 127 for ASCII).  
'a' = 97
'A' = 65

6.) (depends on the student)