Answer:1) h=20
2)n=11
3)s=21
Explanation:
1) 90+3h+2=152
92+3h=152
3h=152-92=60
h=60/3=20
2) 3n+1+112=146
3n+113=146
3n=146-113=33
n=33/3=11
3) 4s+1+158=143
4s=143-59
4s=84
s= 84/4=21
note: the exterior angle is always equal to the sum of its opposite interior angles