I don't understand math hw can you guys please help me?

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.

If the average of x, y and z is 15 what is their sum

Awoman won a 4000-m race with a time of 12.089 min. what was her rate?