Question

15 summation n=1 (2n+1)

A. 240
B. 255
C.210
D. 510

Even if I get an example; I just do not understand what I'm supposed to do!

Answer 1

your spose to add ....

Answer 2

2n+1, find the values when n=1,2,3,4,...,15; and add them all up

Answer 3

Okay... So I add like I do;

2*(1-15)+1 and then I get it?

Answer 4

no, you have 15 different numbers to add up:

2(1) + 1
+ 2(2) + 1
+ 2(3) + 1
+ 2(4) + 1
...
+ 2(15) + 1

Answer 5

Okay got that... So then I take all those and add them up correct?

Answer 6

yep

Answer 7

Awesome Thank you So much!!!! :D

Answer 8

3
+5
+7
+9


your adding up odd numbers it looks like

3
+ 5
+ 7
+ 9
+11
+13
+15
+17
+29
+21
+23
+25
+27
+29
+31

Answer 9

good luck

Answer 10

Awesome again thank you so much!