Use the formula for S n to find the sum of the first five terms of the geometric sequence.
-$a _ { 1 } = - 4.339 , r = 1.475$ (Round to the nearest hundredth)
A) $- 34.10$
B) $17.60$
C) $- 54.64$
D) $12.59$

Question

Quizplus · Accepted Answer

The formula for the sum of the first n terms of a geometric sequence is $ S_n = a_1 \frac{1-r^n}{1-r} $. Plugging in the values $ a_1 = -4.339 $, $ r = 1.475 $, and $ n = 5 $, we calculate the sum as $ S_5 = -4.339 \frac{1-1.475^5}{1-1.475} \approx -54.64 $.

Use the Formula for Sn to Find the Sum of the First

Use the Formula for S_n to Find the Sum of the First