Question

ajutați ma repede va rog dau coroana​

Answer 1

$70 {}^{ {}^{0} } + (4x + 12) {}^{ {}^{0} } + (5x - 10) {}^{ {}^{0} } = 180 {}^{ {}^{0} } \\ 70 + 4x + 12 + 5x - 10 = 180 \\ 72 + 9x = 180 \\ 9x = 108 \\ x = 12 {}^{ {}^{ {0}^{} } }$

${\angle } \: b = 70 {}^{ {}^{0} } \\ \\ \angle \: a = 4\cdot12 + 12 \\ \angle \: a = 60 {}^{ {}^{0} } \\ \\ \angle \: c = 5\cdot12 - 10 \\ \angle50 {}^{ {}^{0} }$