Keeping

c_(2)

constant at

c_(2)=12

, the interval for the net change in

c_(1)

, represented by

\\\\Delta c_(1)

, while the current optimal solution remains optimal, is\

1

\

1

\

-9

\

-1

\ none of the above

Keeping c2 constant at c2=12, the interval for the net change in c1, represented by c1, while the current optimal solution remains optimal, is 1c19 1c19 9c11 1c19 none of the above