Geometric Series HW

Find the sum of the first nine (9) terms of the geometric series if a1 = 1 and r=2.

Find the sum of the first ten (10) terms of the geometric series if a1 = 4 and r = -1/2.

Give your answer as an improper fraction.

Find the sum of the first eight (8) terms of the geometric sequence -1,2,-4,...

Find the sum of the first six (6) terms of the geometric sequence 18,6,2,...

Give your answer as an improper fraction

Find the sum of the first seven (7) terms of the geometric series 2 + 8 + 32 + ...

Find the sum of the first six (6) terms of the geometric series -6 + 4 - 8/3 + ...

leave your answer as an improper fraction

• -267/81

• -266/81

• -264/81

• -265/81

• 6

• 7

• 8

• 5

Which of these formulas represents a geometric sequence?

• 2n = 2,4,6,8,...

• 2ⁿ = 2,4,8,16,...

• n² = 1,4,9,16,...

• 2 + n = 3,4,5,6,...