Answer
$22$
![](https://gradesaver.s3.amazonaws.com/uploads/solution/143ebffb-6709-4a5c-a5fb-1cca0662ee18/result_image/1509394292.jpeg?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAJVAXHCSURVZEX5QQ%2F20240626%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20240626T183658Z&X-Amz-Expires=900&X-Amz-SignedHeaders=host&X-Amz-Signature=2711a80a0a1ab89cbde7ac51a8928ca7e6cf507140cffc198022b5e6e6df1b2b)
Work Step by Step
Using graphing calculator as asked in question we get
$\sum ^{22}_{n=0}\left( -1\right) ^{n}2n=22$ (Also shown in picture)
![](https://gradesaver.s3.amazonaws.com/uploads/solution/143ebffb-6709-4a5c-a5fb-1cca0662ee18/steps_image/small_1509394292.jpeg?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAJVAXHCSURVZEX5QQ%2F20240626%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20240626T183658Z&X-Amz-Expires=900&X-Amz-SignedHeaders=host&X-Amz-Signature=a87a73ecf37e6dbbb6e1b4ff03d29af21f7155979284f2590116d44105134904)
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