To find the length of the missing side x, use Tan trigonometric formula
Tan: 
Tan 21 = 
Tan 21 ×
=
×

x=27.4
X= 27.4 ft
Hope it helps!
The symbol that would make it true would be >
Answer:
-16x+4
Step-by-step explanation:
-6x+2/3(9-15x)-2
Distribute
-6x +2/3 *9 +2/3*(-15x) -2
-6x +6 -10x -2
Combine like terms
-6x-10x +6-2
-16x+4