Question

Which of the following is equivalent to \[\sum_{n=3}^{5} 2n+1\] ?

Answer 1

choices?

Answer 2

27
18
36
30

Answer 3

Plug them in and add:
7+9+11

Answer 4

That means you need to add up 2n+1, starting from n=3 and stopping at n=5:\[\Large \sum_{n=3}^{5} 2n+1 = (2*3+1) +(2*4+1) +(2*5+1)\]

Answer 5

27?

Answer 6

thank you both!