Simplify each square root.

Here are the solutions to the questions:

1. Evaluate $\sqrt{75} + \sqrt{18} - \sqrt{27}$

   Step 1: Simplify each square root.

   $$\sqrt{75} = \sqrt{25 \times 3} = \sqrt{25} \times \sqrt{3} = 5\sqrt{3}$$ $$\sqrt{18} = \sqrt{9 \times 2} = \sqrt{9} \times \sqrt{2} = 3\sqrt{2}$$ $$$$