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3 years ago

30 points! please explain how you got your answer too.

Mathematics

1 answer:

Katyanochek1 [597]3 years ago

6 0

Answer:

12 is your answer

Step-by-step explanation:

1.Flip the sides of the equation so 24/34 is on the right side

2. You then cancel the common factor so your 24/34 turns into 12/17

3. Multiply each side by 85. '

Then simply your new equation will look like this;

4y+12=60

4. subtract 12 from both sides

5. Get 48

5. Divide both sides by 4

6. Your answer is 12

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A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study 380 babies were born, a

Alex Ar [27]

Answer:

The 99% confidence interval estimate of the percentage of girls born is (86.04%, 93.96%). Considering the actual percentage of girls born is close to 50%, the percentage increased considerably with this method, which means that it appears effective.

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 z-score that has a p-value of $1 - \frac{\alpha}{2}$ .

In the study 380 babies were born, and 342 of them were girls.

This means that $n = 380, \pi = \frac{342}{380} = 0.9$

99% confidence level

So $\alpha = 0.01$ , z is the value of Z that has a p-value of $1 - \frac{0.01}{2} = 0.995$ , so $Z = 2.575$ .

The lower limit of this interval is:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.9 - 2.575\sqrt{\frac{0.9*0.1}{380}} = 0.8604$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.9 + 2.575\sqrt{\frac{0.9*0.1}{380}} = 0.9396$

As percentages:

0.8604*100% = 86.04%.

0.9396*100% = 93.96%.

4 0

3 years ago

First four terms of f(n)=3n-1

gavmur [86]

First four terms would be n = 1, 2, 3, 4

f(1) = 3 ( 1 )( 1 + 3 )
= 3 * 4
=12
f(2) = 3 ( 2 )( 2 + 3 )
= 6 * 5
= 30
f(3) = 3 ( 3 )( 3 + 3 )
= 9 * 6
= 54
f(4) = 3 ( 4 )( 4 + 3 )
= 12 * 7
= 84 hope this helps!

8 0

4 years ago

Read 2 more answers

What is the area of a figure with a 3.5 cm height and a 4.8 length

Mamont248 [21]

The area it depends on what kind of shape it is can you tell us what kind of shape it is

7 0

4 years ago

Help me out, thank you.

AveGali [126]

Answer: 38

Step-by-step explanation: