ДАЮ 29 БАЛЛОВ Решите 2 любых задания

Решите задачу:

$1)\; \; y=\sqrt{2x-12}\; ,\\\\OOF:\; \; 2x-12 \geq 0\; ,\; \; x \geq 6\\\\x\in [\, 6,+\infty )\\\\2)\; \; y=\sqrt{9-4x}+ \sqrt{11x-23}\\\\OOF:\; \; \left \{ {{9-4x \geq 0} \atop {11x-23 \geq 0}} \right. \; \left \{ {{x \leq \frac{9}{4}} \atop {x \geq \frac{23}{11}}} \right. \; \left \{ {{x \leq 2,25} \atop {x \geq 2\frac{1}{11}}} \right. \; \; \to \; \; x\in [\, 2\frac{1}{11};\, 2,25\, ]$

$3)\; \; \frac{3x+5}{8}\ \textless \ \frac{5x-1}{4}\; |\cdot 8\\\\3x+5\ \textless \ 10x-2\\\\7\ \textless \ 7x\\\\7x\ \textgreater \ 7\\\\x\ \textgreater \ 1\\\\x\in (7,+\infty )$