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Nikolay [14]
3 years ago
15

S=n(a1+an)/2 gives the partial sum of an arithmetic sequence. What is the formula solved for an?

Mathematics
2 answers:
Veseljchak [2.6K]3 years ago
6 0
S = n(a1 + an)/2
2S = n(a1 + an)
2S = na1 + nan
nan = 2S - na1
an = (2S - n a1)/n
Oksana_A [137]3 years ago
5 0

Just took the quiz.

The answer is an=2S-a1n/n

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Is -5 greater than -9
sveta [45]

Answer: Yes! -5 is greater than -9, because with negatives the smaller numbers are the greatest because they are below 0. Have a good day and Good Luck!


Step-by-step explanation:


4 0
3 years ago
Read 2 more answers
Okay now using distributive property write 2(4x-9) without parenthesis
riadik2000 [5.3K]
2(4x - 9) = 
2 * 4x - 2 * 9 = 
8x - 18

Hope this helps!!
~Kiwi


6 0
3 years ago
Dan invests £18790 into his bank account. He receives 5,3% per year simple
earnstyle [38]

Answer:

697109 pennies

Step-by-step explanation:

First, you use the formula A = P (1 + rt).

R= rate which is 5.3%

T= time which is 7 years.

P is the principle which is 18790

A= is the answer

so first you multiply 7*5.3% which you get 0.371

then you multiply that with 18790 which then you get 6971.09

if you want pennies you multiply it with 100 to get 697109

6 0
3 years ago
I need help please ASAP
Murrr4er [49]

10. Kim gets $7 per hour and gets charged $1 for gloves

Use y to represent her pay and x to represent hours worked.

The equation is y = 7x - 1 because she gets 7 times x hours and there is a minus 1 because of the charge of gloves.

11. The table shows that each increasing hour, 8$ is added. Therefore we need to find the bonus that Kit receives just for showing up. This is when hours equals 0. If 3 hours is 27$ pay, then 2 hours is 19$ pay, 1 hour is 11$ pay and 0 hours is 3$ pay. We find that there is a 3$ bonus just for showing up.

Therefore the equation is y = 8x + 3

12. At x = 0, y = 2 so the y-intercept is 2. The slope is going down 4 and right one which means the slope is -4. The y-intercept is b and the slope is m. If we plug these values into the equation y = mx + b we get:

y = -4x + 2

13. At x = 0, y = -3 so the y-intercept is -3. The slope is going up 1 and right 4 which means the slope is 1/4. The y-intercept is b and the slope is m. If we plug these values into the equation y = mx + b we get:

y = 1/4 x - 3

5 0
3 years ago
Simplify: StartRoot 324 EndRoot 1. Write the prime factorization of the radicand. StartRoot 324 EndRoot = StartRoot 2 times 2 ti
Savatey [412]

Answer:

  18

Step-by-step explanation:

To continue where you left off, ...

  \sqrt{2^2}\times\sqrt{3^2}\times\sqrt{3^2}=2\times 3\times 3=18

The square root of 324 is 18.

3 0
3 years ago
Read 2 more answers
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