Question

please solve this step by step​

Answer 1

Answer:

$10\sqrt{5}$

Step-by-step explanation:

$9\sqrt{5} - 4\sqrt{5} +\sqrt{125}=\\5\sqrt{5} + \sqrt{25 \times 5}=\\5\sqrt{5} + 5\sqrt{5}=\\10\sqrt{5}$