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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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How many degrees are in an angle that turns through 1/3 of a circle?
Leona [35]

Hello!


We know that, in terms of radians and degrees, that an angle that turns through the entirety of a circle is 360 degrees. To find 1/3 of it, we just multiply by 1/3.


360(1/3)=120


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I hope this helps!

6 0
3 years ago
Read 2 more answers
Celia uses the steps below to solve the equation Negative StartFraction 3 over 8 EndFraction (negative 8 minus 16 d) + 2 d = 24.
Troyanec [42]

The error in the steps is that In step 1, she should have also distributed -3/8  over –16d, to get 3 + 6 d + 2 d = 24

<h3>Simplifying linear equations</h3>

Given the following equation as shown below

-3/8(-8-16d)+2d = 24

Step 1 Distribute -3/8 over the expression in parentheses

3 + 6d + 2d = 24

Simply the like terms

3 + 8d = 24

Subtract 3 from both sides of the equation.

8d = 24 - 3

8d = 21

d = 21/8

Hence the error in the steps is that In step 1, she should have also distributed -3/8  over –16d, to get 3 + 6 d + 2 d = 24

Learn more on linear equation here: brainly.com/question/1884491

#SPJ1

3 0
2 years ago
Ragon, who lives on this planet, does a survey and finds that her colony of 237 contains 45 black-footed, one-headed Mizjigs; 69
Gemiola [76]

The answer is <u>A. 98</u>.

Because when you subtract 115 - 45 it equals 70 then you add 70 + 69 which equals 139 then you subtract 237 - 139 it equals <u>98</u> which is your answer!

<h2>      Hope this helps!</h2>
4 0
3 years ago
Solve x2 = 121. how would i figure the answer?
natali 33 [55]

Answer:

= 1 1

= − 1 1

Step-by-step explanation:

4 0
3 years ago
Whats negative eight plus what equals negative one
astraxan [27]
7, if it was plus. but the question says suntraction.
4 0
3 years ago
Read 2 more answers
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