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3 years ago

Solve 3x2 − x = 10

Mathematics

1 answer:

Crazy boy [7]3 years ago

3 0

Option number 2 I think.

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brilliants [131]

Answer:

What's this? I don't understand.

4 0

3 years ago

Read 2 more answers

7.1.35-T Question Help You are the operations manager for an airline and you are considering a higher fare level for passengers

shusha [124]

Answer:

You must survey 784 air passengers.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

The margin of error is:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

95% confidence level

So $\alpha = 0.05$ , z is the value of Z that has a pvalue of $1 - \frac{0.05}{2} = 0.975$ , so $Z = 1.96$ .

Assume that nothing is known about the percentage of passengers who prefer aisle seats.

This means that $\pi = 0.5$ , which is when the largest sample size will be needed.

Within 3.5 percentage points of the true population percentage.

We have to find n for which M = 0.035. So

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.035 = 1.96\sqrt{\frac{0.5*0.5}{n}}$

$0.035\sqrt{n} = 1.96*0.5$

$\sqrt{n} = \frac{1.96*0.5}{0.035}$

$(\sqrt{n})^2 = (\frac{1.96*0.5}{0.035})^2$

$n = 784$

You must survey 784 air passengers.

6 0

3 years ago

Find (f^-1)(a). F(x)=cosx- sin x + pi/2 a=pi/2, 0

Novosadov [1.4K]

Answer:

pi/4

Step-by-step explanation:

my answer is in the image above

7 0

2 years ago

The area of the triangle is square inches. fill in the blanks

Dvinal [7]

Answer:

48sq^2

Step-by-step explanation:

(12*8)/2

96/2

3 0

3 years ago

Riddle! I'm a factor of five I am between 10 and 20 what number am I? easy.

natka813 [3]

Answer:

15 is your number and is a factor of 5 between 10 and 10

6 0

2 years ago