Answer:
[tex]x=45[/tex]
Step-by-step explanation:
The angle sum of a pentagon is 540°
Using this and the angles we know, we can create an equation.
[tex]90+148+112+x+3x+10=540 \\ \\ 360+4x=540 \\ \\ 4x=180 \\ \\ x=45[/tex]
The value of x is 45
