Tina recorded data to represent the amount of carbon dioxide in the atmosphere. She determined the equation of the least squares line to be , where is the number of months since January 1995, and is the number of carbon dioxide molecules per million air particles. What does the value represent in this context?

An unknown number x is at most 10. which graph best represents all the values of x? number line graph with closed circle on 10 and shading to the right. number line graph with open circle on 10 and shading to the right. number line graph with open circle on 10 and shading to the left. number line graph with closed circle on 10 and shading to the left.