Question

Tolong dijawab no 6&7 dengan caranya juga ya

Answer 1

6) (5x) + (4x + 9) = 180°
9x = 180° - 9° = 171°
x = 171° ÷ 9 = 19°
5x = 19° × 5 = 95° (C)

7) (3x + 15)° + (2x + 10)° = 180°
5x + 25° = 180°
5x = 180° - 25°
5x = 155°
x = 155° ÷ 5 = 31°
2x + 10° = 2.31 + 10 = 72° (B)