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wlad13 [49]
2 years ago
7

Assume that different groups of couples use a particular method of gender selection and each couple gives birth to one baby. Thi

s method is designed to increase the likelihood that each baby will be a​ girl, but assume that the method has no​ effect, so the probability of a girl is 0.5. Assume that the groups consist of 40 couples. Complete parts​ (a) through​ (c) below. a. Find the mean and the standard deviation for the numbers of girls in groups of 40 births. The value of the mean is μ
Mathematics
1 answer:
yulyashka [42]2 years ago
6 0
40 because of 0.5 births are gone 40 are coming u. Each time which is the correct
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Please hurry show your work please Solve using elimination (IXL Skill ZQV). Show all your work.
Colt1911 [192]

Answer:

x=5, y=-6, or (5, -6)

Step-by-step explanation:

Hi there!
We are given the following system of equations:
6x + 3y =12
-2x-5y=20

And we want to solve it by elimination, where we will add the equations together, clear one of the variables, solve for the other variable, and then use the value of the solved variable to find the value of the first variable, that was cleared earlier

Before we clear a variable, we want the values of the coefficients to have opposite signs; for example, if we wanted to clear x in these equations, we would want the coefficients of x in both equations to be 2 and -2, or 6 and -6

In order to get the coefficients to have opposite signs, we can multiply or divide the equations by any numbers to get to the desired coefficients

For this solution, let's clear x, but you can choose to clear y if you wish; right now, the coefficients of x are 6 and -2

If we divide both sides of the first equation by 3, the equation will become 2x + y = 4, which if we add that to -2x-5y=20, we'll clear x and only have y left

In that case, take 6x + 3y =12 and divide both sides by 3

6x+3y=12

÷3        ÷3

________

2x + y = 4

Now add 2x + y =4 with -2x - 5y = 20; notice how the 2x and the -2x cancel out:

2x + y = 4

-2x-5y=20
________
0x - 4y =24

-4y=24

Divide both sides by -4

y=-6
We now have the value of y
Now we need to find the value of x

We can substitute -6 as y into either one of the equations (6x + 3y = 12 OR -2x - 5y =20) to solve for x

Let's take 6x + 3y = 12 for example
Substitute -6 as y into the equation:
6x + 3(-6) = 12

Multiply

6x - 18 = 12

Add 18 to both sides

6x = 30
Divide both sides by 6

x=5

The solution is x=5, y=-6, or as a coordinate point, (5, -6)
Hope this helps!

Want to see another example of these types of problems? Try this question! brainly.com/question/24785499

3 0
2 years ago
Find the length of the third side. If necessary, write in simplest radical form. 1 2
tigry1 [53]

Answer:

√3

Step-by-step explanation:

Using the pythagorean theorem, we know that a^2 + b^2 = c^2

In this case, c = 2, which means that a^2 + b^2 = 4

Since we know that a = 1, this means that a^2 is also 1. So, we know that b^2 = 4 - 1

Therefore, b^2 = 3

So, the answer is square root 3

Plz mark as brainliest :D!

7 0
2 years ago
Read 2 more answers
David bought three DVDs in for books for $40 at a yard sale and I bought one DVD and six books for $18 how much did each DVD and
grandymaker [24]

Answer: One DVD is $12 and one book is $1

Step-by-step explanation:

Let the DVD be d and the book be b.

Case 1:

3d + 4b = $40.......(1)

Case 2:

1d + 6b = $18........... (2)

In this equations above, I intend to eliminate variable d, so I'm going to multiply the coefficient of d in (1) to multiply (2)

3 × (1d + 6b = 18)

3d + 18b = 54........ .(3)

Then, subtract (1) from (3)

3d + 18b = 54

- ( 3d + 4b = 40)

3d - 3d + 18b - 4b = 54 - 40

0 + 14b = 14

b = 14/14

b = 1.

Then substitute 1 for b in (2)

1d + 6(1) = 18

d + 6 = 18

d = 18 - 6

d = 12.

(d,b) = (12,1)

4 0
3 years ago
No dia 15/05/2020 as 18h e 40min o G1 divulgou que a Paraíba tem 3.739 casos confirmados e 170 mortes por coronavírus. Qual a po
Andru [333]

Answer:

4.55%

Step-by-step explanation:

To find the percentage of deaths in relation to the number of cases confirmed, we just need to divide the number of deaths by the number of cases confirmed.

So we have that:

Percentage = Deaths / Cases

Percentage = 170 / 3739

Percentage = 0.0455 = 4.55%

The percentage of deaths in relation to the number of cases is 4.55%

5 0
3 years ago
62. Which of the following equations is equivalent
Arte-miy333 [17]

Answer:

B.-2x = 6

Step-by-step explanation:

3x - 4 = 5x + 2

3x-5x = 2+4

-2x=6

6 0
3 years ago
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