The revenue over 30 weeks for a small landscaping company is modeled by the graph shown.

What do the x-intercepts of the graph of the revenue represent? Select the correct number(s) and phrase to complete the sentence.

An upside down V-shape graphed in the first quadrant of a coordinate plane. The shape begins at the origin, increases to its vertex at 15, 300, and then decreases back to the X-axis at X equals 30.