Respuesta :

cookie928
Since that angle all together is 180, 100 is 2z-10 and z is 55
geshu

Step-by-step explanation:

80+(2z-10)=180 {sum of angles in straight line is 180}

  • 80+2z-10=180
  • 70+2z=180
  • 2z=180-70
  • 2z=110
  • z=110/2
  • z=55

now, 2z-10=2×55-10

=110-10

=100

therefore z=55 & 2z-10=100

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