Let x be the number of players, so we can write:

where y represents the total cost. Since the team raised $1128.75 to go to a tournament, we have

Then, by subtracting 856.50 to both sides, we have

Then, by dividing both sides by 24.75, we obtain

Then, by rounding up to the nearest whole number, there must be 81 players.
In summary, the answers are:
