Ageometric sequence is defined by the recursive formula t1 = 64, tn =
tn - 1 / 2, where n ∈n and n > 1. the sequence is

a) -64, -16, -8, -4, -2, -1,
b) 64, 16, 8, 4, 2, 1,
c) 64, 32, 16, 8, 4, 2,
d) 64, 128, 256, 512, 1024, 2048,

Step-by-step explanation:

you need a common difference between consecutive terms to be constant, like 1,2,3,4 or 2,4,6,8, or 1,3,6,9

the circle graph is not a function.

step-by-step explanation:

the graph of the circle is not a function.

because for a graph to be a function, each value of x must give one value of y

in the circle, the values of x for -2< x< 2 each give 2 values of y.

hence this is not a function.