1.  Notes, book
2.  Homework
3.  2
4.  2,5,8
5.  Cin3 = Cout2 =  G2 + P2G1 + P2P1G0 + P2P1P0Cin0
6.  Think Outputs
7.  Think inputs and outputs
8.  Write down truth table, go from there.  (AB + AC + BC)
9.  11ns for Cin1 to appear
    22 more ns for Cin2 to be valid
    33 ns for sum if using 3-input XOR
    29 ns if using 2-input XOR

10. Error in data bit 5, location 10.

11. D' = (!X & !Y1) + (!Y2 & !Y3) + (X & !Y2) + (!X & Y2 & Y3)

12. Y1' = (!Y2 & !Y3) + (Y2 & Y3) + (!Y1 & !Y3)
    Y2' = (X & Y1) + (!Y1 & Y3)
    Y3' = (!Y1) + (Y2 & Y3) + (!X & Y2)
     Z  = (Y2 & Y3) + (!X + Y3) + (X & Y1 & Y2)

13. S = (!Y1 & !Y2) + (!Y1 & Y3)
    R = (Y1 & !Y2 & !Y3) + (Y1 & Y2 & Y3)
    J = (Y3) & (X & Y1)
    K = Y3
    T = !Y1

14. There are 5 states initially (0,15,25,30,40), which can be reduced down to 
    4 states (30 and 40 can be merged).  From this you should be able to draw 
    the appropriate arcs, make the table and complete the problem.