Someone please help me with this.

Hard Math Question?

Minimize Z=9x1 + 4x2 + 12x3

The 1,2, and 3 are superscript.

Subject to the constraints:

3x1+x2+4x3 larger or equal to 24

3x1 + x2 + 2x3 larger or equal to 18

x1 >= 0, x2 >=0, x3 larger or equal to 0

What is Z, x1, x2, and x3?

All numbers after letter are superscript. Thanks!