Answer:
4
Step-by-step explanation:
i think 7
14) x = 30°
15) x = 50°
14) 60 + x = 90
x = 90 - 60
x = 30°
15) 130 + x = 180
x = 180 - 130
x = 50°
Hope this helps
sum is 1,2,4,8,16,32,64,128,256,512