Final answer:
The line-of-sight distance from the television camera to the case of the stadium is approximately 3300 m.
Step-by-step explanation:
To find the line-of-sight distance from the television camera to the case of the stadium, we can use trigonometry. Let's consider a right-angled triangle where the angle of depression is 7 degrees and the altitude of the blimp is 400 m. The line-of-sight distance is the hypotenuse of the triangle.
Using the trigonometric function 'tan', we can calculate:
tan(7) = Opposite/Adjacent = 400/distance
distance = 400/tan(7)
distance ≈ 3267 m
Rounding to the nearest hundred meters, the line-of-sight distance from the television camera to the case of the stadium is 3300 m.