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marta [7]
3 years ago
7

Which expression is equivalent to 4/9 (2n - 3)? Please explain

Mathematics
1 answer:
serg [7]3 years ago
5 0

Answer:

n=3/2

Step-by-step explanation:

4/9 (2n - 3)

8/9n-4/3=0

8/9n=4/3 (multipluy by 9)

8n=12

n=12/8 which simplifies to 3/2

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Which shows one way to determine the factors of x3 + 5x2 – 6x – 30 by grouping?
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Answer:

D

Step-by-step explanation:

group them first :

( x3+5x2) and ( -6x-30)

then simply by gcf ( greatest common factor) :

x2(x+5) and -6(x+5)

and just add them together:

x2(x+5)-6(x+5)

bonus :

it can be written as (x2-6)(x+5)

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3 years ago
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3 years ago
A survey of 76 commercial airline flights of under 2 hours resulted in a sample average late time for a flight of 2.55 minutes.
nika2105 [10]

Answer:

The best point of estimate for the true mean is:

\hat \mu = \bar X = 2.55

2.55-1.96\frac{12}{\sqrt{76}}=-0.148    

2.55+1.96\frac{12}{\sqrt{76}}=5.248    

Since the time can't be negative a good approximation for the confidence interval would be (0,5.248) minutes. The interval are tellling to us that at 95% of confidence the average late time is lower than 5.248 minutes.

Step-by-step explanation:

Information given

\bar X=2.55 represent the sample mean for the late time for a flight

\mu population mean

\sigma=12 represent the population deviation

n=76 represent the sample size  

Confidence interval

The best point of estimate for the true mean is:

\hat \mu = \bar X = 2.55

The confidence interval for the true mean is given by:

\bar X \pm z_{\alpha/2}\frac{\sigma}{\sqrt{n}}   (1)

The Confidence level given is 0.95 or 95%, th significance would be \alpha=0.05 and \alpha/2 =0.025. If we look in the normal distribution a quantile that accumulates 0.025 of the area on each tail we got z_{\alpha/2}=1.96

Replacing we got:

2.55-1.96\frac{12}{\sqrt{76}}=-0.148    

2.55+1.96\frac{12}{\sqrt{76}}=5.248    

Since the time can't be negative a good approximation for the confidence interval would be (0,5.248) minutes. The interval are tellling to us that at 95% of confidence the average late time is lower than 5.248 minutes.

7 0
3 years ago
Which model can be used to represent 0.111
weeeeeb [17]

Answer:

11.8845

Step-by-step explanation:

11.8845 to the up and down answer it will be down

4 0
3 years ago
Sorry ignore this question.
Anna11 [10]
Okay

(Thanks for the points)
7 0
3 years ago
Read 2 more answers
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