Question

Matrix

Answer 1

http://prntscr.com/4bqas1

Answer 2

@mathmale

Answer 3

1)e)

Answer 4

@JoannaBlackwelder

Answer 5

Here is a good explanation of how to find the inverse.
http://www.mathwords.com/i/inverse_of_a_matrix.htm

Answer 6

Basically, you switch the top left and bottom right numbers and make them negative, but let the other numbers remain the same.

Answer 7

Okay

Answer 8

Thanks @JoannaBlackwelder

Answer 9

No worries :)