Answer:
Step-by-step explanation:
81
=
3
4
 and 
27
=
3
3
, so this equation can also be written as
3
4
x
=
3
3
(
x
+
2
)
=
3
3
x
+
6
.
Since the bases are now the same, we can equate exponents to get
4
x
=
3
x
+
6
 so that
x
=
6
(technically this equating of exponents requires the fact that exponential functions (with base not equal to 1) are one-to-one functions).
(do u understand?)
 
        
             
        
        
        
Square Perimetre = Side x 4
So a length of a square ground is 160/4 = 40 (m)