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)
Responses

y=128x
y is equal to 128 to the x th power

y=128(2)x
y is equal to 128 times 2 to the x th power

y=0.5(128)x
y is equal to 0 point 5 times 128 to the x th power

y=128(0.5)x
y is equal to 128 times 0 point 5 to the x th power

Answer 1

y = 128(0.5)^x

Reason: each round you multiply the number of teams by 1/2, so after x rounds it's 128*(1/2)^x.