Question

Find S22 for -6 + (-4) + (-2) + 0 …
A. 330
B. 332
C. 334
D. 336

Answer 1

c.d= d=-4-(-6)=-4+6=2
sn=n/1{2a+(n-1)d}
n=22
a=-6
plug in the values and get the answer

Answer 2

i keep getting 66

Answer 3

\[S22=\frac{ 22 }{ 2 }\left\{ 2\left( -6 \right)+\left( 22-1 \right)2 \right\}=11\left( -12+42 \right)=330\]