(answer + 10 ! ) the graph in the xy‑plane below represents the function a graphic designer uses to position the outer edge of a rainbow on a billboard, where x represents feet from the left edge of the billboard and y gives the feet above the lower edge of the billboard. the rainbow begins at the left edge and ends at the bottom edge of the billboard. how many feet from the lower left edge of the billboard does the rainbow end? a. 7 feet b. 10 feet c. 40 feet d. 48 feet