The pentagon is the one with 5 sides. Good Luck!
(1 + x) (13) = 13+6.5
13x + 13 = 19.5
13x = 6.5
x = 0.5
The item was marked up by 50%
Do you have notes so I can look at them to help you? Cause I pretty good at math but I need the notes.
DONT GO TO THAT LINK ITS A VIRUS AND ITS A BOT