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3 years ago

Answers this pls PLS PLS PLS I NEED HELP

Mathematics

2 answers:

Monica [59]3 years ago

4 0

There would be 56 airplanes

raketka [301]3 years ago

3 0

3+4=7
7 x 8=56
There will be 56 airplanes :)Hope this helped!

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A student must answer any three of the four essay questions on a social studies test. How many different selections of questions

Musya8 [376]

I'm pretty sure it would be 12....I think.

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3 years ago

One hundred rats with mothers that were exposed to high levels of tobacco smoke during pregnancy were put through a simple maze.

Paul [167]

Answer:

The 90% confidence interval for pis (0.7342, 0.8658).

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 $1 - \frac{\alpha}{2}$ .

For this problem, we have that:

100 rats mothers, 80 went right. So $n = 100, \pi = \frac{80}{100} = 0.8$

90% confidence level

So $\alpha = 0.1$ , z is the value of Z that has a pvalue of $1 - \frac{0.1}{2} = 0.95$ , so $Z = 1.645$ .

The lower limit of this interval is:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.8 - 1.645\sqrt{\frac{0.8*0.2}{100}} = 0.7342$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.8 + 1.645\sqrt{\frac{0.8*0.2}{100}} = 0.8658$

The 90% confidence interval for pis (0.7342, 0.8658).

3 0

3 years ago

Math question down below

lozanna [386]

Answer:

315

Step-by-step explanation:

42 is 84 percent of 50. If you apply this to 375, you get 315 because 84 percent of 375 is 315

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3 years ago

Solve the equation <br> Y +3 = -y + 9

sukhopar [10]

Answer:

The answer is 3.

Hope it helps..

4 0

2 years ago

Read 2 more answers

Anyone know how to simplify a whole number into a mixed number or a improper fraction???

AlekseyPX

Answer:

Example any whole number over one would be an improper fraction, so 2=2/1, something like 5/3=1 2/3 would be a mixed number, subtract the numerator by the denominator, how ever many times you can subtract is the whole number and the amount remaining is the numerator, keep the same denominator,,, hope that makes sense

Step-by-step explanation:

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3 years ago