Ooh! This is the math I'm studying right now! This'll be good practice.
[10, 11
2, 6]
The inverse would be:
[0.1875, -0.34375
-0.625, 0.3125]
The vector's angle is 18.4349489 (rounded) degrees.
Explicit forumula: 10 divided by 2 to the (n-1)th power.
The last two statements are true (though...