Answer:
x = 6.4 feet.
Explanation:
If a triangle has side lengths a, b, and c then its perimeter (P) will be given by ( a + b + c ).
Now, in this problem, the perimeter of a triangle is given to be 27.1 feet,
And its sides are 9.8 feet, 10.9 feet, and x feet.
Therefore, 27.1 = ( 9.8 + 10.9 + x )
⇒ 27.1 = 20.7 + x
⇒ x = 6.4 feet (Answer)