The domain of the function refers to the set of all possible input values (usually represented as x) for which the function produces a valid output. To determine the domain where the function is at least 300, we need to analyze the graph and identify the x-values for which the y-values (or function output) are 300 or above.
Start by locating the horizontal line at y = 300 on the graph. Look for the points where this line intersects the curve of the function. The x-values at these intersection points will help define the interval of the domain.
If the graph of the function is above the line y = 300 between certain x-values, that range will be part of the domain. For example, if the function is above 300 for x-values between a and b, then the domain would be represented as [a, b]. If the function dips below 300 at any point, those x-values must be excluded from the domain.
In conclusion, to specify the domain where the function is at least 300, identify and list the x-values where the function meets or exceeds this threshold based on the graph provided.