Can anyone solve this problem and show work

Check the solution of all options

First option
p + 2 1/2 = 5
p = 5 - 2 1/2
p = 5 - 5/2
p = 10/2 - 5/2
p = 5/2
p = 2 1/2

Second option
2 + p = 2 1/2
p = 2 1/2 - 2
p = 1/2

Third option
p - 2 1/2 = 5
p = 5 + 2 1/2
p = 7 1/2

Fourth option
4 - p = 2 1/2
-p = 2 1/2 - 4
-p = 5/2 - 4
-p = 5/2 - 8/2
-p = -3/2
p = 3/2
p = 1 1/2

The equation that has p = 2 1/2 as its solution is first option

What class is this? i have no idea and i'm not going to give you the wrong answer. do you have a graph that goes with all the questions