In the following cryptarithm, each letter represents its own digit. Determine the greatest value of the 4-digit number OUCH. + STUB TOE OUCH

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.