Question

Please Help, Very Stuck

Answer 1

What is the sum of the arithmetic series

(-15)+0+15+30+...+195

Answer 2

1,355
1,350
1,335
1,000

are my options. i think its C

Answer 3

First, you need to find out how many numbers does the sequence contain by using this formula:
an = a1+(n-1)d

Answer 4

i honestly have no idea how to do any of this..

Answer 5

Nvm i got it..

Answer 6

The answer is B