Question

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?(1 point)

y=128(2)x

y=128x

y=128(0.5)x

y=0.5(128)x

Answer 1

y = 128(0.5)^x

Each round the number is multiplied by 1/2, so after x rounds it's 128*(1/2)^x.