Question

вбвбвбвбвдудвдвсдадда222200

Answer 1

$\sqrt{28-10\sqrt{3}} -5=\sqrt{28-2*5\sqrt{3}} -5=\sqrt{25-2*5\sqrt{3}+3} -5=\\ \\ \sqrt{(5-\sqrt{3})^2} -5= 5-\sqrt{3} -5=-\sqrt{3}\\ \\ OTBET: \ B)$