Question: i need help with these two questions please. Find the sum. 4 . (-3)- 13) i=1 14) 1=1 15 20 4(n-1) 7n- 2 15) 16)

i need help with these two questions please.

i need help with these two questions please. Find the sum. 4

Find the sum. 4 . (-3)- 13) i=1 14) 1=1 15 20 4(n-1) 7n- 2 15) 16) n -8

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