What does the "6" symbol mean in figured bass?
first inversion for triad.
You are in the Key of C. What triad is this? 
C major triad in root position.
what is the correct inversion symbol?

7/5
A 6 with a / in it means?
Raise the 6th by a half step starting from the bass.
You are in the key of D minor. What triad is this? 
F major triad in root position.
what is the correct inversion symbol?

7
#
What does this mean?
The third pitch is raised in the given 7th chord.
You are in the key of C major. What 7th chord is this? 
what is the correct inversion?

4/3
If the symbol is 6/4, how high up do you have to count to find the original root?
4 letters up.
You are in D minor and you see this example, what chord do you have? 
First inversion d minor triad.
what is the inversion symbol?

4/2
When you see this symbol in figured bass: " ", what does this mean?
It is root position.
If you see only this symbol: # what does it mean?
Raise the third.
what is the inversion symbol?
6/5