Question

Calculate 1-2+3-4+5-6+...............+179-180

follow me

I follow you

the answers is -90

give me the right process

if proceed is right , I follow you

promise. ​

Answer 1

Step-by-step explanation:

-179 is the answer ............

Answer 2

S =   1 - 2 + 3 - 4 + 5 - 6 + ___ + 179 - 180

+   S =       1 - 2 + 3 -  4 + 5 - 6 + ___ + 179 - 180

----------------------------------------------------------------

2S =           1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - ___ - 1 - 1 - 1 - 180

2S = -180

S =   $\frac{-180}{2}$

S = -90