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Please hep me I do not understand this at all. Thank you so much this means a lot!!! 

 Apr 5, 2019
 #1
avatar+105182 
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First one 

 

Not sure how to input these into your calculator..(you might have to ask your teacher).....but here is the result :

 

https://www.wolframalpha.com/input/?i=sum+%5B100(-4)%5E(n+-+1)%5D,+n+%3D+1+to+n+%3D+4

 

Second one....likewise....we have

 

https://www.wolframalpha.com/input/?i=sum+%5B98+-+2n%5D+,++n+%3D+1+to+n+%3D+11

 

cool cool cool

 Apr 5, 2019

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