What is the distance between -10 and 10 on the number line?

im pretty sure that it is 20 but correct me if im wrong if so im really sry

(2,20) means that the 2 is 2 hours and 20 is 20$. so there both 20$ for 2 hours only the same price. like it says. so, the dunk tank and the bounce house are the same price (20$) for the same amount of time (2 hours).

hope i