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2jpz
Angle B is 39.855°, hope this helps
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Answer:

Angle B = 39.85°

Step-by-step explanation:

We have sine formula

         [tex]\frac{a}{sinA}=\frac{b}{sinB}=\frac{c}{sinC}[/tex]

Here A = 74°, a = 126 and b =84

Substituting

            [tex]\frac{126}{sin74}=\frac{84}{sinB}\\\\sinB=0.6408\\\\B=39.85^0[/tex]

Angle B = 39.85°

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