Question

Someone please help me

Answer 1

`15.0118^o`

Explanation:

`\mathrm{We\ use\ the\ sine\ law\ to\ solve\ this\ question.}\\\mathrm{(a)/(sinA)=(c)/(sinC)}\\\\\mathrm{or,\ (31)/(sin138^o)=(12)/(sinC)}\\\\\mathrm{or,\ sinC=(12)/(31)sin138^o}\\\mathrm{or,\ sinC = 0.259}\\\mathrm{or,\ C=sin^(-1)0.259=15.0118^o}`