Question

VOCALOID ONLY.

There are six terms in this series (n = 6), where the first term is 4 (a1 = 4), and the last term is −11 (an = −11). Substitute these values in the formula to find the sum of the series.

Sn = n over 2(a1 + an)

S6 = 6 over 2 (4 − 11)

S6 = 6 over 2(−7)

S6 = 3(−7)

S6 = −21

Answer 1

Arithmetic Series Formula:

Sn = n over 2 (a1 + an) @Vocaloid this is the formula but I dont understand it o.o

Answer 2

@ThatCreepyBoy

you are given n, an, and a1

just plug these into the formula and solve

Answer 3

Would it be Sn = 6/2(4 + -11)?

Answer 4

yes good

get into the habit of writing +- as -

Answer 5

Okie Dokie so it would be 6/2(4 - 11)? o.o

Answer 6

good, and what does that equal?

Answer 7

-21? o.o

Answer 8

good

Answer 9

Yay :D

Answer 10

:)

Answer 11

for these problems, always compare what you are given to what is inside the formula

Answer 12

Will dos ^_^ thank ya so much voca!