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Vinil7 [7]
2 years ago
5

PLLKEEASE HELPPPPPPP ASAPP

Mathematics
1 answer:
erica [24]2 years ago
7 0

Answer:

x = 19

Step-by-step explanation:

(5x + 4)° + (x - 2)° + (3x + 7)° = 180°

(5x + x + 3x)° + (4 - 2 + 7)° = 180°

9x° + 9° = 180° → ÷9

x + 1 = 20

x = 20 - 1

x = 19

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