+0  
 
0
72
2
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Please help me 

 Jan 23, 2020
 #1
avatar+16 
+1

TALK TO ME

 Jan 23, 2020
 #2
avatar+18319 
+1

If there is a fraction bar between the "i2 +i" term and the "2", then what you have is:

 

(52 + 5)/2  + (62 + 6)/2 + (72 + 7)/2 + (82 + 8)/2 + (92 + 9)/2 + (102 + 10)/2 + (112 + 11)/2 + (122 + 12)/2

 

Now, it's between you and your calculator ...

 Jan 23, 2020

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