Answer: 16.
Step-by-step explanation:
All angles in any pentagon add up to 540 degrees.
As such, you can represent each angle in an equation in which the sum of all the angles is 540, as follows:
[tex](12z-42)+(7z+24)+(z+38)+(6x+49)+(z+39)=540\\\\27z + 108 = 540\\27z = 432\\\\z=16[/tex]
