Find the derivative of `f(x) = 10 x`.

Explanation

To find the derivative of the function \( f(x) = 10x \) using the first principles of derivatives, we will follow these steps:

### Step-by-Step Solution:

1. **Write the definition of the derivative using first principles**:
The derivative \( f'(x) \) is defined as:
\[
f'(x) = \lim_{h \to 0} \frac{f(x+h) - f(x)}{h}
...