In this scenario, the domain of a function is the set of all possible inputs to the function. Here, we're looking at the number of years since the year 2000. So, our input is represented by x. Since we're interested in years from 2000 and onwards, we cannot have a negative number of years. Thus, our domain will be all nonnegative integers starting from 0.
Now, if we consider the range of the function, it represents the set of all possible outputs from this function. In this context, the output is the number of cameras sold in the given years – represented by y. It's important to note that, in reality, it's impossible to sell a negative number of cameras. Therefore, the range of this function will be all real numbers that are greater than or equal to zero.
Thus, we can conclude that the domain and range for these functions would be all nonnegative integers and all real numbers greater than or equal to zero, respectively.