The Answer should be either x=15 or x=5 I got both.
We would need the info about the lengths of the sides of said polygon.
Yes because all sides would be equal to 5 which would give you 5*4 = 20 units.
Answer:
2+2 ÷ x.4 - 19.r + 30 = 5 the hidden number behind x is 5
