michellelucero michellelucero

14-05-2020
Mathematics

contestada

pls help me i dont understand this

pls help me i dont understand this class=

Respuesta :

starwars04 starwars04

14-05-2020

Answer:

Equation: 139 + 3x + (5x - 10) + (10x - 9) + 3x = 540 (not simplified, see below for simplified)

x = 20

Step-by-step explanation:

If the sum of the angles is 540°, then that means you add them up to get 540°.

139 + 3x + (5x - 10) + (10x - 9) + 3x = 540

129 + 8x + (10x - 9) + 3x = 540

120 + 18x + 3x = 540

120 + 21x = 540

21x = 420

x = 20

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