pls pls help me with this triangle, i’ve been doing math for hours now and i just need help with this pls pls thank you

Answer:
Angle B=90 degrees
BA^C= 40 degrees
Step-by-step explanation:
Angle B=90 degrees (right angle =90 degrees)
90+50+BA^C=180
140+BA^C =180
BA^C=180-140
BA^C= 40 degrees