Find ∑(5 – 2 k ) when k goes from 2 to 7.

Question

-24

24
I am clueless
30

-18

Answer 1

7
∑(5 – 2 k ) = (5-4)+(5-6)+(5-8)+(5-10)+(5-12)+(5-14) = 1-1-3-5-7-9 = -24
k=2

Answer 2

Thanks