Question

PLEASE HELP :)
What is the sum of an 11–term arithmetic sequence where the first term is 5 and the last term is 55?

Answer 1

Just keep adding up the terms from 5 to 55, so 5+10+15+20...

Answer 2

so keep adding by 10's all the way to 55? I dont get it? :/

Answer 3

Okay i got 330?

Answer 4

No, keep adding by 5s. So you start with 5+(next term is 10) So you do 5+10, third term si 15 so:

5+10+15 and so on, until you hit 55.

Answer 5

And 330 is correct.