The image contains a mathematical expression to be simplified. The expression is:

$\sqrt{5} + 6\sqrt{20}$

To simplify this, let's work through it step-by-step:

1. Simplify the square root of 20: $\sqrt{20} = \sqrt{4 \times 5} = \sqrt{4} \times \sqrt{5} = 2\sqrt{5}$

2. Substitute this into the original expression: $\sqrt{5} + 6\sqrt{20} = \sqrt{5} + 6(2\sqrt{5}) = \sqrt{5} + 12\sqrt{5}$

3. Combine like terms: $\sqrt{5} + 12\sqrt{5} = 13\sqrt{5}$

So, the simplified result is: $13\sqrt{5}$

Would you like further details or have any questions? Here are five related questions to expand on this topic:

1. How do you simplify square roots involving products of numbers?
2. Can you always combine terms with square roots in an expression?
3. What is the process for rationalizing a denominator that contains a square root?
4. How would you handle expressions with cube roots, such as $\sqrt[3]{20}$?
5. How does factoring play a role in simplifying square roots?

Tip: Always look for perfect square factors when simplifying square roots to make the process easier.