There are 128 teams in a softball tournament. In each round, half of the teams are eliminated. Which function can be used to find the number of teams remaining in the tournament after x rounds?
A. y = 128(2)^x
B. y = 0.5(128)^x
C. y = 128(0.5)^x
D. y = 128^x
The correct function to find the number of teams remaining in the tournament after x rounds is C. y = 128(0.5)^x.
In each round, half of the teams are eliminated. This means that after the first round, there will be 128/2 = 64 teams remaining. After the second round, there will be 64/2 = 32 teams remaining. This pattern continues, with the number of teams being halved each round.
In the function y = 128(0.5)^x, 128 represents the initial number of teams, and (0.5)^x represents the number of teams left after x rounds.