Resposta :

3478elc
 2x +8°a)x=7° ==> 2.7 + 8 = 22°b)x=11°==> 2.11+8= 30°c)x=17°==> 2.17+8=42°d)x=20°==>2.20+8=48°

  b) 3x+3° 
 a)x=7°==>3.7+3°==> 24°  b)x=11°==>3.11+3°==>36 °  c)x=17° ==>3.17+3°==>54°  d)x=20°==>3.20+3°==>63 ° 

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