Represent the following sentence as an algebraic expression, where "a number" is the letter x. You do not need to simplify. 4 is added to twice a number.

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.