$\"\"$

The function is $\"\"$ .

When the region is entirely with in the first quadrant the values of $\"\"$ are positive, but the $\"\"$ value depends on the values of $\"\"$ and $\"\"$ also.

When the valus of $\"\"$ and $\"\"$ are negative and $\"\"$ are negative,then only the value of $\"\"$ is maximum.

Hence, the value of $\"\"$ doesnot have a positive maximum value if the feasible region lies entirely with in the first quadrant.

$\"\"$

No, Since if $\"\"$ and $\"\"$ are negative then value of $\"\"$ is negative.