The number of teams remaining in each round of a single-elimination tennis tournament represents a geometric sequence where f(n) is the number of teams competing and variable n is the round. there are 32 teams remaining in round 4 and 8 teams in round 6.

write the explicit formula by showing work algebraically.

this is how far i got since the two points are

(4, 32), (6, 8), you have to do something like r^2 * a = b. , how do you find r? r is the rate.