Answer:
 2.7 < x < 12.3 meters
Step-by-step explanation:
You want to know the possible lengths of the third side of a triangle, given that two sides are 7.5 m and 4.8 m.
The triangle inequality requires the sides of a triangle have the relationship ...
 a + b > c
for any assignment of side lengths to the letters a, b, c. In effect, this means the length of a third side must lie between the sum and the difference of the other two sides.
 7.5 -4.8 < x < 7.5 +4.8
 2.7 < x < 12.3 . . . . . meters