Question

What is the sum of the finite arithmetic series?
(-5)+0+5+10+...+65
a)900
b)455
c)450
d)445

Answer 1

http://www.regentsprep.org/regents/math/algtrig/atp2/arithseq.htm
Scroll down to find the equation to find the sum of the finite series.

Answer 2

65 = 13*5

so there are 13+2 = 15 terms in the series

Answer 3

first term is -5
last term is 65

Answer 4

use the series formula :


sum = n/2(first term + last term)

Answer 5

here n = number of terms = 15

Answer 6

i got 120 tho??

Answer 7

15/2(-5 + 65)

Answer 8

15/2(60)

15(30)

450

Answer 9

thank youu