Question

Алгебра 9 класс помогите пж

Answer 1

$\sqrt{\dfrac{12-2r}{12} } \\\\\\\dfrac{12-2r}{12} \geq 0\\\\\\12-2r\geq 0\\\\\\-2r\geq -12\\\\\\r\leq 6\\\\\\Otvet:\boxed{pri \ r\leq 6}$