|--------------------------------------------|
|--------------------------------------------|
|----9--(E)----------------------------------|
|----9--(B)----------------------------------|
|----8--(F)----------------------------------|
|--------------------------------------------|


Originally Posted by: ThorfinnFrisken
1. In the image, if the X was played, I know would be a F power chord, but is it still an F power chord if I mute the D string, or if not what is it?
[/quote]
This would be an F major7 flat5 (no3rd) chord with all three notes.

F is the root (1st).
B is the flat 5th.
E is the major 7th.

Without the B note on the 9th fret of the D string it is a diad (two simultaneously played notes) of a major 7th.

F is the root (1st).
E is the major 7th.
[QUOTE=ThorfinnFrisken]
2. What method do people use to mute that string? Like what finger? I've been using the tip of my ring finger that is on the G string.
www.vanthor.com/pic2.jpg

Multiple options here.

1. Pad of index finger leaning over from the A string.
2. Middle finger lightly resting but not pressing down enough to make the note sound.
3. Tip of ring finger leaning over from the G string.

Just in case you mean this.

|--------------------------------------------|
|--------------------------------------------|
|----10-(F)----------------------------------|
|----10-(C)----------------------------------|
|----8--(F)----------------------------------|
|--------------------------------------------|

That is an F power chord; an F5.

F is the root (1st).
C is the 5th.
F is the root an octave higher (8th or 1st).

Without the middle note C, it is an F diad; root and octave. And the muting ideas still apply. Hope that helps!