Find a12 given the geometric sequence 2, -6, 18, -54, ... A. 1,062,882
B.-1,062,882
C. 354,294
OD. -354,294

Step-by-step explanation:

Since the above sequence is a geometric sequence

For an nth term in a geometric sequence

where

a is the first term

r is the common ratio

n is the number of terms

From the question

a = - 6

To find the common ratio divide the next term by the previous term

That's

r = 18/-6 = - 3 or -54/18 = - 3

Since we are finding the 12th term

n = 12

Substitute these values into the above formula

We have

We have the final answer as

Hope this helps you

78.59 is the mean

step-by-step explanation:

circle area = pi * radius^2

if diameter = 10 then radius = 5

circle area = pi * 5^2

circle area = pi * 25

circle area = 78.5398163397 square units

step-by-step explanation: