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Sergio039 [100]
3 years ago
13

6) (3x+3)(x - 1) A) 3x² – 3 B) 16x² + 28x - 8 C) 16x + 36x + 8 D) 16x2 + 8

Mathematics
1 answer:
telo118 [61]3 years ago
6 0

Answer:

the answer to this is

3x {}^{2}  - 3

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The International Air Transport Association surveys business travelers to develop quality ratings for transatlantic gateway airp
motikmotik

Answer:

The 95% confidence interval for the population mean rating is (5.73, 6.95).

Step-by-step explanation:

We start by calculating the mean and standard deviation of the sample:

M=\dfrac{1}{n}\sum_{i=1}^n\,x_i\\\\\\M=\dfrac{1}{50}(6+4+6+. . .+6)\\\\\\M=\dfrac{317}{50}\\\\\\M=6.34\\\\\\s=\sqrt{\dfrac{1}{n-1}\sum_{i=1}^n\,(x_i-M)^2}\\\\\\s=\sqrt{\dfrac{1}{49}((6-6.34)^2+(4-6.34)^2+(6-6.34)^2+. . . +(6-6.34)^2)}\\\\\\s=\sqrt{\dfrac{229.22}{49}}\\\\\\s=\sqrt{4.68}=2.16\\\\\\

We have to calculate a 95% confidence interval for the mean.

The population standard deviation is not known, so we have to estimate it from the sample standard deviation and use a t-students distribution to calculate the critical value.

The sample mean is M=6.34.

The sample size is N=50.

When σ is not known, s divided by the square root of N is used as an estimate of σM:

s_M=\dfrac{s}{\sqrt{N}}=\dfrac{2.16}{\sqrt{50}}=\dfrac{2.16}{7.071}=0.305

The degrees of freedom for this sample size are:

df=n-1=50-1=49

The t-value for a 95% confidence interval and 49 degrees of freedom is t=2.01.

The margin of error (MOE) can be calculated as:

MOE=t\cdot s_M=2.01 \cdot 0.305=0.61

Then, the lower and upper bounds of the confidence interval are:

LL=M-t \cdot s_M = 6.34-0.61=5.73\\\\UL=M+t \cdot s_M = 6.34+0.61=6.95

The 95% confidence interval for the mean is (5.73, 6.95).

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3 years ago
How do you solve this
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How many years would it take for a person it the united states to eat 855 pound of apples?
Oxana [17]
Depends on many pounds of apples they eat a year. Take the number they eat a year and divide it by 855<span />
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3 years ago
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Sofia has four times as many dollars as her friend jessie has. together the two have $35. how much money do they each have?
garik1379 [7]
4J = s
J + s = J + 4j = 5j = 35

J = 7
s = 28
3 0
3 years ago
The set of points (1, 1), (2, 2), (3, 3) is collinear.
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Answer:

the answer will be True

Step-by-step explanation:

as the points match up to form a prefect straight line

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