Answer:
hello : x = 98°
Step-by-step explanation:
note :
sum of angles in polygonal is : ( n -2) × 180° ..... n : number of side
in this exercice : n = 7
sum of angles is : (7 -2 ) × 180° = 5× 180° = 900 °
x = 900° - ( 142° +110° +140° +142° +122°+146°) = 900° - 802°
x = 98°
