PLEASE HELP WILL MEDAL!!! (ans. must be correct)

The summation expression in the following series has an absolute value in it. Expand and evaluate the summation notation. What is the sum of the series?

Question

PLEASE HELP WILL MEDAL!!! (ans. must be correct)

The summation expression in the following series has an absolute value in it. Expand and evaluate the summation notation. What is the sum of the series?

anonymous · Answer

attachment

anonymous · Answer

OKAY i may have messed up on the last 2

anonymous · Answer

i will redeem myself on this one

anonymous · Answer

I'm not really sure if I trust your mathematical abilities with this no offense.

anonymous · Answer

Okay i swear to god dude, the answer is 19, i triple checked my work this time

anonymous · Answer

Okay nice! Thank you!

anonymous · Answer

Did i redeem myself for terribly messing up the last 2?

anonymous · Answer

Maybe, help me with this next one I'm about to put up.

anonymous · Answer

Alright i will try to redeem myself on this next one