Respuesta :

48+6x-28+2x=180
8x=180-20
x=160/8
x=20
So x=20
m∠B=6x-28
Put x=20 in, so is 6·20-28=92
So, m∠B=92°
m∠C=2x
Put x=20 in, so is 2·20=40
So, m∠C=40°
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