The notation d(4) typically refers to the derivative of a function. It represents the rate of change of the function with respect to the independent variable (usually denoted as x) evaluated at the specific value of x, in this case, x = 4.
To find the derivative of a function d(4), you need to know the original function. Let's say the function is f(x). The process of finding the derivative involves differentiating the function with respect to x using differentiation rules, such as the power rule, product rule, chain rule, etc.
Once you have the derivative function, you can substitute x = 4 into it to find the value of d(4). This will give you the rate of change of the function at x = 4.