Answer: After five rounds, only 4 teams remain.
Step-by-step explanation:
at the begginning we have 128 teams, after the first round, we have half of that, this is 128/2.
after the second round, we have half of that: (128/2)/2 = 128/(2*2)
and so on, so if n is the number of rounds, the amount of theams left can be written as:
t(n) = 128/(2^n)
and for n= 5, we have:
t(5) = 128/(2^5) = 128/32 = 4
After five rounds, only 4 teams remain.