Based on the table in the image, you are asked to:

1. Evaluate $f(7)$:
   From the table, when $x = 7$, $f(7) = 15$.
   Therefore, $f(7) = 15$.

2. Solve $f(x) = 8$:
   From the table, $f(x) = 8$ when $x = 3$.
   Therefore, $x = 3$.

Would you like any further details or have any questions?

Here are 5 related questions to expand on this:

1. How can you find $f(x)$ from a graph rather than a table?
2. What does it mean for a function to be increasing or decreasing based on the table?
3. How would you interpret the function's domain and range using the data in this table?
4. Can a function have more than one $x$ value corresponding to a given $f(x)$?
5. How would you interpolate a value for $f(x)$ between two known points in the table?

Tip: When solving for $f(x) = a$, always check if there are multiple solutions for $x$, as functions can sometimes have more than one input yielding the same output.