6 divided by 2(1+2) plz show work

In a graph with several intervals o data how does a constant interval appear? what type of scenario produces a constant interval?

Haruka hiked several kilometers in the morning. she hiked only 66 kilometers in the afternoon, which was 25% less than she had hiked in the morning. how many kilometers did haruka hike in all?

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?