Answer:
x=9.23
Explanation:
The sum of all the angles in any geometric figure with 4 sides must equal 360.
(10x+6)+(13x-2)+(8x-1)+71=360
We add all the x
10x+13x+8x=360-71+1+2-6
31x=286
x=286/31
4.3m questions
5.6m answers