Question

-5,+(-8)+(-11)+....+(-230)

Answer 1

Step-by-step explanation:

-5,+(-8)+(-11)+....+(-230)

= -254

-254 is right answer

Answer 2

Answer:

-11930

Step-by-step explanation:

a = -5

d = 3

$a_{n$ = a+(n-1)d

-230 = (-5)+(n-1)3

-225 = (n-1)3

$\frac{-225}{3}$ = n-1

75 = n-1

76 = n

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$S_{n} =\frac{n}{2}$(a+b)

$S_{76} = \frac{76}{2}$[-5+(-230)]

$S_{76}$ = 38[-235]

$S_{76$ = -11930