3 years ago

Find S12 for the series 2 + 5 + 8 +...

2 answers:

7 0

Hi, I'm pretty sure by S12 you mean the sum of all the 12 terms in the series 2 + 5 + 8 + .....

Then, first you find the pattern:
5 -2 = 3
8 -5 = 3
This is an arithmetic series with a common difference of 3. Next, we find the last term, or the 12th term.

A12 = A1 + (n - 1)d
A12 = 2 + (12 - 1)3
A12 = 35

Since, we know the first and last terms of the series, we could find the sum by this formula:

S = (n/2)*(A1 + A12)
S = (12/2) * (2 + 35)
S = 222

The answer is 222.

olga55 [171]3 years ago

4 0

2+5+8+11+14+17+20+23+26+29+32+35

You might be interested in

Hi, i am doing a graded practice test for algerbra 2 and I need some help with a few of the questions, thanks so much.

Mashcka [7]

Given the equation:

$\log _2(7x)+\log _22=1$

As we know: log a + log b = log (ab)

So,

$\begin{gathered} \log _2(7x\cdot2)=1 \\ \log _2(14x)=\log _22 \\ \\ 14x=2 \\ x=\frac{2}{14} \\ \\ x=\frac{1}{7} \end{gathered}$

So, the answer will be x = 1/7

7 0

3 months ago

Read 2 more answers

Sam has 21 books Mary has 9 times more books than Sam how many books does Mary have

Kobotan [32]

Ok so the answer is 189 books. It states Sam has 21 books and it says Mary has 9 times more than Sam. So when you see the word times you multiply. 21 times 9 is 189. I hope this answer helps and remember to mark as brainliest answer! :)

4 0

2 years ago

stephanie had 22 marbles she gave maggie and sam each 4 marbles explain how you can find how many marbles stephanie has left

Salsk061 [2.6K]

22 - 8= 14

(8 because 4 marbles each)

8 0

2 years ago

PLEASE HELP!!! ALL ANSWERS WITH EXPLANATIONS PLEASE!!!

Furkat [3]

Answer:

1) a

2) a