Answer:
45
Explanation:
use the formula (n-2)*180 the get the value of the total angles in this figure where n is the number of sides
using this formula we get that its equal to 540 so
x+(3x+10)+112+148+90=540
x+3x+10+112+148+90=540
(add like terms)
4x+360=540
4x=540-360
4x=180
x=180/4
x=45