Which formula can be used to sum the first n terms of a geometric sequence?

Sum of first n terms = a1 * (r^n - 1) / (r - 1).

Step-by-step explanation:

Sum of n terms = Sn = a1 * (r^n - 1) / (r - 1)  where a1 = first term , r = common ratio

and n is the number of terms.

it's B on edge :)

Step-by-step explanation:

the answer is simply just 6n add the two together as they have an n

113.1

step-by-step explanation:

v=4

3πr3=4

3·π·33≈113.09734