12) Angle ACD= Angle ABC+ Angle CAB ====> You MAY end here
That is, Angle ACD= 132+21
Angle ACD= 153
13) Angle ABC+ Angle BAC= Angle ACD====> You MAY end here
That is, Angle ABC +16=143
-16= -16
Angle ABC=127
Without knowing the full question we cannot answer please provide more info
Answer: 311.5
Step-by-step explanation: 35*8.9=311.5
311.5/35=8.9