Final answer:
The ratio of the longest side to the perimeter of the given right-triangular-shaped billboard is 25/56.
Step-by-step explanation:
In a right triangle, the longest side is always the hypotenuse. So in the given triangle with side lengths 25 feet, 7 feet, and 24 feet, the longest side is 25 feet.
The perimeter of a triangle is the sum of its three sides. So the perimeter of this triangle is 25 + 7 + 24 = 56 feet.
The ratio of the longest side (25 feet) to the perimeter (56 feet) is therefore 25/56.
To simplify this ratio, divide both the numerator and denominator by their greatest common divisor, which is 1. The simplified ratio is 25/56.