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Aleksandr [31]
3 years ago
5

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

Mathematics
2 answers:
Svetllana [295]3 years ago
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
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BRAINLIEST
Dima020 [189]

Answer:

1. 2.9

2. 51 inches

3. (if you can send a picture of the question, I can tell you an answer.

Step-by-step explanation:

for number 1:

You have to add the scores on the left and divide it by the total. What I did was multiply each number on the right with it's pair and added it up. I got 111. Afterwards,  I totalled the number of students (I got 38) and divided the scores by the number of students to get 2.9.

for number 2:

You do the same thing as number one but instead of multiplying pairs, you add the heights. I got 255 and then divided it by 5 total heights. I got 51 inches.

for number 3: I didn't get the graph to tell you the answer but I can tell you what everything means.

Symmetric means that both sides of the graph are equal and if you fold the graph in half horizontally, you should get the same shape.

Gaps are where you see blanks in the graph where the data gets cut off and then has stats again.

Cluster is when a huge amount of data is gathered in one area.

Peak is where the data (x-axis) reaches it's highest point (highest y-axis point).

Good luck and please give me Brainliest if you liked my answer!

6 0
3 years ago
When you can walk to miles in 30 minutes how many miles can she walk in two hours
djyliett [7]
Easey

ratio and proprotion

or
knowlege


1. ratio and proportion
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2hours=60*2=120mins
xdistance
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8 miles


knowlege way
30 mins=1/2 hour
30 mins=1/4 of 2 hours
2=1/4 of 2 hours
2*4=8
8 miles
3 0
3 years ago
Simplify the expression:<br><br> 4(9p + 1)
Tju [1.3M]

Answer:

36p+4

Step-by-step explanation:

4 0
2 years ago
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I found this out by subtracting and adding on both sides.

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3 years ago
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 The difference between the product of four and a number and six
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