10. Show the following:

(a) 

(b) 
 

11. (a) Show that 
 

(b) Show that if each element of a fixed row of a three by three determinant D is multiplied by a factor k, the new determinant equals kD.
 

12. (a) Evaluate .

(b) Show that if a three by three determinant D has a row of zeros, then D = 0.

(c) Show that if a three by three determinant D has a column of zeros, then D = 0.

13. Show the following:

(a) 

(b) 

(c) 

(d) 

(e) 
 
 

Wednesday, June 10, 1998