Answer:
48° or 138°
Step-by-step explanation:
[tex]\displaystyle Complementary\:Anlges\:[Sum\:up\:to\:90°] \\ Supplementary\:Angles\:[Sum\:up\:to\:180°][/tex]
[tex]\displaystyle 90° = 42° + m∠4 \: \: \: \: \: 180°= 42° + m∠4[/tex]
[tex]\displaystyle 48° = m∠4 \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: 138° = m∠4[/tex]
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