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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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A company advertises that its cans of caviar each contain 100 g of their product. A consumer advocacy group doubts this claim, a
Blizzard [7]

Answer:

The value of the test statistic is -3.14.

Step-by-step explanation:

Test statistic:

t = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}

In which X is the sample mean, \mu is the expected value, \sigma is the standard deviation and n is the size of the sample.

A company advertises that its cans of caviar each contain 100 g of their product.

This means that \mu = 100

They calculate a sample mean weight of 99 g and a sample standard deviation of 0.9 g. Sample of 8 cans.

This means that X = 99, \sigma = 0.9, n = 8

So the test statistic will be given by:

t = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}

t = \frac{99 - 100}{\frac{0.9}{\sqrt{8}}}

t = -3.14

The value of the test statistic is -3.14.

8 0
3 years ago
What is the best first step in solving the equation 3 + = 5?
Dafna1 [17]

Answer:

5 - 3

Step-by-step explanation:

easy way to find out

5-3= your answer in one step

3 0
3 years ago
Please help me solve and explain
Anna11 [10]
I would say go with with B

5 0
3 years ago
Read 2 more answers
The length of a rectangle is 3 less than 2 times the width if the perimeter is 60 what is the length
Semenov [28]
P=2w+(2w-3)
60=4w-3
63=4w
15.75=w

l=2w-3
l=(2×15.75)-3
l=31.5-3
l=28.5

This answer doesn't add up so if you meant the COMBINED width then:

P=w+(2w-3)
60=3w-3
63=3w
21=w

l=2(21)-3
l=42-3
l=39

(This answer checks out so this is probably what you meant hope I helped)
7 0
3 years ago
Jamar is buying bottles of juice for his his class party A pack of 12 bottles of juice cost $3.96 determine the cost of 1 bottle
NeX [460]

Answer: The cost of 1 bottle of juice is $0.33 or 33 cents.

Step-by-step explanation: Divide the total cost by the amount of bottles of juice to find how much each bottle costs.

\frac{3.96}{12} = 0.33

7 0
3 years ago
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