Graph . find domain and range.

i have the graph, but i don't know how to find the domain and range?

For either square root to exist, you require that . This is true for all , since is always non-negative. This means the domain of as a function of is all real numbers, or or .

Now, because is non-negative, and the smallest value it can take on is 7, it follows that the minimum value for the positive square root must be , while the maximum value of the negative root must be . This means the range is , or , or .

The answer is 6 weeks