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3 years ago

Help me plss need help with theses three

Mathematics

1 answer:

fiasKO [112]3 years ago

4 0

interior angle of a regular 18-gon.
It is easier to calculate the exterior angle of a regular polygon of n-sides (n-gon) by the relation
exterior angle = 360/n
For a 18-gon, n=18, so exterior angle = 360/18=20 °
The value of each interior angle is therefore the supplement, or
Interior angle = 180-20=160 degrees.

Naming of a 9-gon
A polygon with 9 vertices is called a nonagon (in English) or enneagon (French ennéagone, but the English version is sometimes used)
You had a good start with the correct answer.

Exterior angle of a 15-gon
The exterior angle of a 15-gon can be calculated using the relation given in the first paragraph, namely
Exterior angle = 360/15=24 degrees

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Rational Expressions <br> 5n/15 + 7n/15

liq [111]

8/n17 to the power of 6 and also this is not a correct answer i just hate having to answer questions...

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3 years ago

SmartShop's profits have been growing at 5% per year. This year their profits were approximately $500,000. What were their profi

nata0808 [166]

Answer:

$475,000

Step-by-step explanation:

Since the profits increase by 5% each year, this means that each year the new profit is 105% of the old ones.

To find last year's profits, we divide this year's by 105%, or 1.05:

500000/1.05 = 476190.48

This means the profits last year were about $475,000.

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3 years ago

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A.Kiera runs 575.8 meters in 73.04 seconds.

jok3333 [9.3K]

Answer:

This isnt really answer able. Its really a opinion

Step-by-step explanation:

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3 years ago

A new centrifugal pump is being considered for an application involving the pumping of ammonia. The specification is that the fl

cricket20 [7]

Answer:

1) We need to conduct a hypothesis in order to check if the true mean is higher than 5 gpm, the system of hypothesis would be:

Null hypothesis: $\mu \leq 5$

Alternative hypothesis: $\mu > 5$

2) $df=n-1=8-1=7$

Since is a one sided test the p value would be:

$p_v =P(t_{(7)}>2.233)=0.0304$

3) For this case is we use a significance level of 1% or 99% of confidencewe see that $p_v >\alpha$ and we don't have enough evidence to conclude that the specification is satified. But if we use a value of significance $\alpha=0.05$ or 95% of confidence we see that $p_v$ and we have enough evidence to conclude that the specification is satisfied.

Step-by-step explanation:

Data given and notation

$\bar X=6.5$ represent the sample mean

$s=1.9$ represent the sample standard deviation

$n=8$ sample size

$\mu_o =5$ represent the value that we want to test

$\alpha$ represent the significance level for the hypothesis test.

t would represent the statistic (variable of interest)

$p_v$ represent the p value for the test (variable of interest)

Part 1: State the null and alternative hypotheses.

We need to conduct a hypothesis in order to check if the true mean is higher than 5 gpm, the system of hypothesis would be:

Null hypothesis: $\mu \leq 5$

Alternative hypothesis: $\mu > 5$

If we analyze the size for the sample is <30 and we don't know the population deviation so is better apply a t test to compare the actual mean to the reference value, and the statistic is given by:

$t=\frac{\bar X-\mu_o}{\frac{s}{\sqrt{n}}}$ (1)

t-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".

Calculate the statistic

We can replace in formula (1) the info given like this:

$t=\frac{6.5-5}{\frac{1.9}{\sqrt{8}}}=2.233$

Part 2: P-value

The first step is calculate the degrees of freedom, on this case:

$df=n-1=8-1=7$

Since is a one sided test the p value would be:

$p_v =P(t_{(7)}>2.233)=0.0304$

Part d: Conclusion

If we compare the p value and the significance level given $\alpha=0.01$ we see that $p_v>\alpha$ so we can conclude that we have enough evidence to fail reject the null hypothesis, so we can't conclude that the height of men actually its significant higher compared to the height of men in 1960 at 1% of signficance.

Part 3

For this case is we use a significance level of 1% or 99% of confidencewe see that $p_v >\alpha$ and we don't have enough evidence to conclude that the specification is satified. But if we use a value of significance $\alpha=0.05$ or 95% of confidence we see that $p_v$ and we have enough evidence to conclude that the specification is satisfied.

4 0

3 years ago

The graph of an arithmetic sequence is shown.

GalinKa [24]

Answer:

The fifth term is 7

Step-by-step explanation:

Looking at the graph

we have the ordered pairs

(1,5),(2,5.5),(3,6),(4,6.5),(5,7)

Let

$a_1=5\\a_2=5.5\\a_3=6\\a_4=6.6\\a_5=7$

The common difference in this arithmetic sequence is 0.5

The value of the fifth term is a_5

therefore

The fifth term is 7

7 0

3 years ago

Read 2 more answers