Geometric Series

Find S₁₀ for the geometric series with

a₁ = 4 and r = 2.

• 4092

• 2046

• 4096

Find S₁₂ for the geometric series with

a₁ = -2 and r = 2.

Find S₂₀ for the geometric series with

a₁ = 1000 and r = 0.5.

• $1000\left(\frac{1}{2}\right)^{20}$

• $1000\left(1-\left(\frac{1}{2}\right)^{20}\right)$

• $2000\left(1-\left(\frac{1}{2}\right)^{20}\right)$

• $2000\left(\frac{1}{2}\right)^{20}$

Find S9 for the geometric series with 

a1 = -3333 and r = $\frac{1}{3}$  

• -3999.369

• -4999.246

• -2999.357

• -5999.501

• -7999.777

If S₈ = 510 and r = 2, what is a₁?

If S₁₁ = 354292 and r = 3, what is a₁?

If S₅ = -16.3804 and r = $\frac{9}{10}$  , what is a₁?

Given the summation, $\sum_{k=1}^n5\left(2\right)^{k-1}=5115$ , 

what is the Sum of n (Sn)?

Given the summation, $\sum_{k=1}^n5\left(2\right)^{k-1}=5115$ , 

what is the first term (a1)?

Given the summation, $\sum_{k=1}^n5\left(2\right)^{k-1}=5115$ , 

what is the common ratio (r)?