The problem requires evaluating the function $f(x) = 10x - 15$ for $x = 5$.

Solution:

1. Substitute $x = 5$ into the function: $f(5) = 10(5) - 15$
2. Calculate $10 \times 5 = 50$.
3. Subtract 15 from 50: $f(5) = 50 - 15 = 35$

Answer:

$f(5) = 35$

Would you like further details or have any questions?

Here are some additional related questions:

1. What is $f(x)$ when $x = 10$ for the same function?
2. How does the function $f(x) = 10x - 15$ change if the coefficient of $x$ is altered?
3. Can you find the value of $x$ when $f(x) = 0$ for this function?
4. How would the graph of $f(x) = 10x - 15$ look like?
5. What happens to $f(x)$ if we add a constant term, say $+20$, to the function?

Tip: When substituting values into functions, carefully follow the order of operations (PEMDAS: Parentheses, Exponents, Multiplication and Division, Addition and Subtraction).