Use a graphing utility to find the sum of the geometric sequence. Round answer to two decimal places, if necessary.
-$\sum _ { k = 1 } ^ { 5 } 3 ( - 4 ) ^ { k }$
A) -2,460
B) 244
C) -7,710
D) -156

Question

Quizplus · Accepted Answer

The sum of the geometric sequence can be calculated using the formula for the sum of a geometric series: $ S_n = a \frac{r^n - 1}{r - 1} $, where $ a = 3 $, $ r = -4 $, and $ n = 5 $. Plugging in these values gives the sum as -2,460.

Use a Graphing Utility to Find the Sum of the Geometric