The given expression is:

$\log_5{5} + \log_5{4}$

To combine the two logarithmic terms, you can use the logarithmic property of addition, which states:

$\log_b{x} + \log_b{y} = \log_b{(xy)}$

Applying this property:

$\log_5{5} + \log_5{4} = \log_5{(5 \cdot 4)}$

Simplifying the multiplication inside the logarithm:

$\log_5{20}$

Thus, the expression as a single logarithm is:

$\log_5{20}$

Would you like more details on logarithmic properties or have any questions?

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Here are 5 related questions:

1. How do you simplify $\log_b{a} - \log_b{c}$?
2. What is the value of $\log_b{b}$ for any base $b$?
3. How do you expand $\log_b{(xy)}$?
4. Can $\log_b{a}$ ever be negative? If so, under what conditions?
5. How do you convert a logarithmic equation into an exponential form?

Tip: Remember, the logarithm of a product can be split into a sum of logarithms using the product rule of logarithms.