Final answer:
The constant of proportionality in the equation y = 52x represents the number of hours of football practice per day in this problem.
Step-by-step explanation:
The constant of proportionality in the equation y = 52x represents the number of hours of football practice per day in this problem.
To find the constant of proportionality, we can divide the total hours of football practice (12 1/2) by the number of days in the week (5):
Constant of proportionality = Total hours of football practice / Number of days in the week = 12 1/2 / 5 = 2 1/2 = 2.5 hours
Therefore, option A: 52; Hours of football practice, is the correct answer. The constant of proportionality represents the number of hours of football practice per day.