What is the recursive rule for this geometric sequence?

1/2,−2,8,−32,...

a1=−12;an=4⋅an−1

a1=12;an=2⋅an−1

a1=12;an=−4⋅an−1

a1=−4;an=12⋅an−1

Will mark brainliest with 20 points! the table shows how far object 1 traveled as a function of time. *time (seconds) - 2 4 6 8 *distance traveled (feet) - 18 36 54 72 the equation shows how far object 2 traveled in feet as a function of time in minutes. *f(x) = 10x which object traveled at a faster speed? justify your response.