1: the one that looks like an x
2:regular pentagon
3: 4
4: 1
5: 1 line of symmetry
As the complete angle is right angle that is 90°
So both the angles should add up to 90°
(3x+2) + (x+16)=90
combine the like terms
4x+18 = 90
Subtract 18 from both sides
4x= 72
divide both sides by 4
x=18
3n + 5 = 6
<u> - 5 - 5</u>
<u>3n</u> = <u>1</u>
3 3
n = ¹/₃
I think it is 192 inches long?