28-3c-4=2c+12+c now group this on the same side. Remember when you move the number to the other side of = it changes the sign.
28-4-12=2c+c+3c
12=6c
12/6=c
2=c
B is the answer ok have a good day
529.72......................
Answer:
angle B=122degree
Step-by-step explanation:
straight line AC =180degree, then 180-(21+37)=122 degree
a=b*sinA/sinB=84.5
c=b*sinC/sinB=141.9