Answer:
The 20% tip would be 18%
The 80% mark down would be 0.8 I think
The 60% I'm not sure for the 60% one
The 10% I'm not sure for that one but I think it would be 3.75
I think for 75% mark down it would be 0.7 I'm not sure tho and I'm not sure for the rest
Sorry if I'm wrong but hope this helps:)
First polygon side is 3.96
the second polygon side is 3.75
5x + 2/2 = 2x - 1
2/2 is basically 1 so
5x + 1 = 2x - 1
isolate the variable
5x + 1 = 2x - 1
-1 -1
5x = 2x -2
-2x -2x
3x = -2
solve
3x/3=-2/3
x=-2/3
Straight vertical line going through 6 value on x axis