Use a graphing utility to find the sum of the geometric sequence.
15
n
5
Σ
6
n=1
The sum is
- (Round to three decimal places as needed.)
phony

Math it's appreciated. (picture provided)

Me i'm timed right now! there's 4 answer

Grandpa ernie is shrinking! over the past 4 years his height decreased by a total of 2.4 cm. it decreased by the same amount each year. what was the change in grandpa ernie's height each year