Question

What's the value of X and the measure of angles B and C ? Please help

Answer 1

sum of interior in a triangle = 180
so

48 + 6x - 28 + 2x = 180
8x + 20 = 180
8x = 160
  x = 20

m<B = 6x - 28
m<B = 6(20) - 28
m<B = 120 - 28
m<B = 92

m<C = 2x
m<C = 2(20)
m<C = 40

Answer 2

48+(6x-28)+(2x)=180
8x=180-48+28
8x=160
x=20

B°=120-28=92°
C°=40°