How do I find a change in scale factors? I forgot to write notes on how to find a change in scale factors and can’t seem to find a video. A formula and/or explanation would be absolutely wonderful! Or, a video recommendation from someone who explains it would do as well. :) This is for a seventh-grade level question.

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.