$a_1=2,\ \ \ r=-2,\ \ \ S_n=22$  Determine the number of terms n in the series

• 6

• 7

• 8

• 5

Determine the sum of the series written in Sigma Notation. 

• -65104
• -71570
• -73483
• -22003

• A

• B

• C

• D

Find the sum: t₁ = -1, r = 3, n = 9

• S₉ = 3280

• S₉ = -9842

• S₉ = -4921

• S₉ = -9841

Evaluate the geometric series below:
-1 -3 -9 - 27...,  S8

• -3280
• -3135
• -3323
• -3343

What is the sum of the first 15 terms, round to the nearest whole number:

• 200

• 100

• 125

• -99

Find S₆

-4, -8, -16, -32...

• -253

• -252

• 4

• -235

Find the sum of the first 6 terms of the geometric sequence 2, 8,32,128,... .

• 3072

• 7320

• 2370

• 2730

What is the sum of the first ten terms of the sequence 4, -12, 36, -144 . . . ?

(Do not type any commas or spaces in your answer)

Formula for a Finite Geometric Series?

• No idea

• S = (Xk+1-X1)/(r-1)

• S = (Xk+1-X1)/(r+1)

• S = (Xk+1+X1)/(r-1)