Question

PLEAZE HELP IM STUCK PLS

Answer 1

Answer:

$T_{23}=-153$

Step-by-step explanation:

$T_{23}=a+(n-1)d$

$=a+(23-1)d=a+22d$

Now $a=-21$ and

$d=-27-(-21)\\=-6$

So $T_{23}==21+((22)6\times-1)$

$=-153$