Question

(40 points) I need some help please. An answer definition is appreciated as well.

Answer 1

IT IS -9 BUT THE OTHER GUY ANSWERED BEFORE ME SORRY LATE

Answer 2

-9

Explanation:

We are summing the 3rd 4th and 5th terms because k goes from 3 to 5

The third term is

-2(3) +5 = -6+5 = -1

The fourth term is

-2(4) + 5 = -8+5 = -3

The fifth term is

-2(5) +5 = -10 +5 = -5

Add these 3 terms together

-1+-3+-5 = -9