Where are the choicess................
Are you searching for how much Eva has or Justin?
I think this is more of an opinion question. What someone could solve mentally may not be the same as someone else's.If it were my worksheet, I'd circle all of them but it may be different for you.
At your level, I'd probably circle:
54 - 10
93 - 20
and 39 - 2
X= any coordinate on the x-axis . but I'm confused about the " f "