find the possible values of x.
the perimeter is less than or equal to 51 meters.

Answer-
The value of x can be anything between 0 to 15
Solution-
Perimeter of a geometrical figure is the sum of lengths of all its sides.
So, the value of the perimeter of the given pentagon would be,
[tex]=8+8+10+10+x\\\\=(36+x)\ meters[/tex]
As given in the question that, the perimeter is less than or equal to 51 meters.
So,
[tex]\Rightarrow 36+x\leq 51[/tex]
[tex]\Rightarrow x\leq 15[/tex]
As the side length can not be negative, so x must be positive, i.e
[tex]0<x\leq 15[/tex]