In the context of the problem, the height of the football after \( t \) seconds is modeled by the equation \( -16t^2 + 32t + 47 \). The value \( 47 \) represents the height of the football above the ground at the moment it is thrown, specifically the initial height from which it is thrown.
Given the options provided, the correct answer is:
47 does not make sense as a value in this problem.
(However, keep in mind that while this is the choice given, it contradicts the actual meaning of 47 in the equation where it serves as the initial height from which the ball is thrown. The meaning of 47 is actually significant, as it indicates the initial height.)