in 2015 there were about 22 million teenagers (ages 13-17) in the united states. they each sent an average of 900 text messages per month. About how many text messages did all of the teenagers in the united states send each month
express your answer in scientific notation

Bruce is going to call one person from his contacts at random and Probability to call a person not from his neighborhood = 1/5 or 0.2

Total number of contacts = 25

Total number of contacts that are from his neighborhood = 20

Find the probability of calling one person not from his neighborhood.

Find the number of contacts not from his neighborhood.

Total contact = 25

Total from his neighborhood = 20

Total not from his neighborhood = 25 - 20

Total not from his neighborhood = 5

Find the probability of calling one person not from his neighborhood:

Total contact = 25

Total not from his neighborhood = 5

P(call a person not from his neighborhood) = 5/25

P(call a person not from his neighborhood) = 1/5 or 0.2

or we can say that,

probability = number of favorable outcomes

number of possible outcomes

there are five favorable outcomes (the 25-20=5) people not from his neighborhood

there are 25 total possible outcomes (the 25 total contacts)

P (call a person not from his neighborhood) = 5/25= 0.2

Therefore, the probability is 0.2

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the first five terms of the sequence t(1)=4 and t(n+1)=t(n)-3 are: 4, 1, -2, -5, -8.

To find the first five terms of the sequence defined by the formula t(1) = 4 and t(n+1) = t(n) - 3, we can use the recursive formula to find each term in the sequence:

t(1) = 4

t(2) = t(1) - 3 = 4 - 3 = 1

t(3) = t(2) - 3 = 1 - 3 = -2

t(4) = t(3) - 3 = -2 - 3 = -5

t(5) = t(4) - 3 = -5 - 3 = -8

Therefore, the first five terms of the sequence are: 4, 1, -2, -5, -8.

A recursive formula is a formula used to define a sequence, where each term of the sequence is defined in terms of the previous terms. In other words, to find a particular term in the sequence, you need to know the value of the previous term. This can be useful for generating sequences with complex patterns, such as the Fibonacci sequence. However, recursive formulas can also be more difficult to work with than explicit formulas, which give a direct formula for calculating any term in the sequence without relying on previous terms.

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Hence the value for MN midsegment is triangle is  x = MN = 12 units.

M and N are, respectively, the midpoints of JK and JL in the triangle JKL.

MN is a midsegment of the triangle JKL because it is parallel to KL.

What exactly is  midsegment?

A triangle's midsegment is a line segment that joins the midpoints of its two sides. A triangle's midsegment is always half as long as its third side and runs parallel to it at all times.

Triangles have the following characteristics:

Three sides, three vertices, and three angles make up the polygonal shape known as a triangle.

- The total of a triangle's three angles is 180 degrees.

- Any two triangle sides added together will always be longer than the third side.

- Less than the third side's length separates the two sides of a triangle from one another.

- A triangle's perimeter is the product of its three sides.

KL is 12 units in length. MN is therefore 12 units long as well.

Hence, x = MN = 12 units.

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The correct answers are:

C. The probability of being included in the sample is the same for all members of the population of interest.

D. Sampling must be done without replacement.

The correct answer is, "The probability of being included in the sample is the same for all members of the population of interest" and "sampling must be done without replacement."

An independent random sample is a subset of a population that is selected in such a way that each member of the population has an equal and independent chance of being included in the sample. This means that the probability of being included in the sample is the same for all members of the population, which is why the statement "the probability of being included in the sample is the same for all members of the population of interest" is correct.

In addition, sampling must be done without replacement, which means that once an individual has been selected for the sample, they cannot be selected again. This ensures that each member of the population has an equal chance of being selected and that the sample is not biased towards certain individuals.

The statement "sampling must be done with replacement" is incorrect because it implies that individuals can be selected multiple times, which would not result in an independent random sample. The statement "every time an individual is selected for the sample, each of the remaining individuals has a higher chance of being included" is also incorrect because it suggests that the sampling process is not independent, which would also result in a biased sample.

Therefore, The probability of being included in the sample is the same for all members of the population of interest and sampling must be done without replacement.

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Answer: I think you forgot to attach the question

Step-by-step explanation:

Here are the solutions for each situation, listed from least to greatest:

In mathematics, probability refers to the measure of the likelihood or chance of an event occurring. It is a numerical value between 0 and 1, where 0 represents an impossible event, and 1 represents a certain event.

The probability of an event A is denoted by P(A) and is calculated by dividing the number of favorable outcomes by the total number of possible outcomes in a given situation.

For example, if we roll a fair six-sided die, the probability of rolling a 4 is 1/6 because there is only one favorable outcome (rolling a 4) out of six possible outcomes (rolling any number from 1 to 6).

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Answer: 10 children

Step-by-step explanation:

Given:

First, let's find the cost "per child"

Notebook: 1 × 1.15

+

Pencils: 2 × 0.34

Equation for cost per child:

1(1.15) + 2(0.34)

Solve:

1.15 + 0.68

= 1.83$

We have $20. So, to find how many children can be provided with supplies, we divide 20 by 1.83 (which is the cost per child)

20 ÷ 1.83 = 10.928

(Gives us a terminating decimal)

Since we can't just give a child .928 of a set of supplies, we round down to 10.

Therefore,

10 children can be provided with supplies with $20.

1. The data show's a symmetric distribution

The second diagram is left skewed

2. The second shape would have a greater standard deviation because its skewness is more

3. √(2 + 5 + 0 + 3 + 4)²/17

= √(0.8235)²

= √0.6781

= 0.8234

using the same calculation the standard deviation is 1.1418

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The calculated z-value of 2.45 is less than the critical value of 2.58, we fail to reject the null hypothesis.

To test whether there is convincing evidence that the proportion of people who experience choice blindness is different for the picture group and actual candy group, we need to conduct a hypothesis test.

Let p1 be the proportion who experiences choice blindness based on a picture treatment, and p2 be the proportion who experiences choice blindness based on seeing the actual candy treatment.

Our null hypothesis is that there is no difference between the two proportions:

H0: p1 = p2

Our alternative hypothesis is that there is a difference between the two proportions:

Ha: p1 ≠ p2

We will use a two-sample z-test to test this hypothesis. The test statistic is:

z = (p1 - p2) / sqrt(p*(1-p)*(1/n1 + 1/n2))

where p = (x1 + x2) / (n1 + n2) is the pooled sample proportion, x1, and x2 are the number of people who experienced choice blindness in the picture and actual candy groups, respectively, and n1 and n2 are the sample sizes.

Using the given information, we can calculate the sample proportions as:

p1 = (21/50) = 0.42

p2 = (13/50) = 0.26

The pooled sample proportion is:

p = (21 + 13) / (50 + 50) = 0.34

The sample sizes are n1 = n2 = 50.

Substituting these values into the formula for the test statistic, we get:

z = (0.42 - 0.26) / sqrt(0.34*(1-0.34)*(1/50 + 1/50)) = 2.45

Using a standard normal distribution table, we can find the critical values for a two-tailed test with a significance level of 0.01:

[tex]z_crit = ±2.58[/tex]

Since our calculated z-value of 2.45 is less than the critical value of 2.58, we fail to reject the null hypothesis. Therefore, we do not have convincing evidence to conclude that the proportion of people who experience choice blindness is different for the picture group and actual candy group at a significance level of 0.01.

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Answer:

x = 3

Step-by-step explanation:        

Check attachment. I did this lesson in class so I know.        

The value of [tex]\frac{XZ}{YZ}[/tex] include the following: C. [tex]\frac{180}{181}[/tex]

In Mathematics and Geometry, Pythagorean's theorem is represented by the following mathematical equation:

a² + b² = c²

Where:

a, b, and c represent the side lengths of a right-angled triangle.

In order to determine the length of XZ in right-angled triangle XYZ, we would have to apply Pythagorean's theorem.

YZ² = XY² + XZ²

181² = 19² + XZ²

XZ² = 32,761 - 361

XZ = √32,400

XZ = 180 units

For the ratio, we have:

Ratio = XZ/YZ

Ratio = 180/181

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Missing information:

The question is incomplete and the complete question is shown in the attached picture.

The polynomial that was factored using algebra tiles with an algebra tile configuration of 0 tiles in the factor 1 spot and 0 tiles in the factor 2 spot, and 15 tiles in the product spot in 3 columns with 5 rows with 1 labeled x squared, 2 are labeled x, the 4 tiles below x squared are labeled negative x, and the 8 tiles below the x tiles are labeled negative is: x² - 2x - 8.

When you factor a polynomial using algebra tiles, you arrange the tiles in the form of a rectangle. The area of the rectangle gives the product of the two binomials, while the sides of the rectangle give the sum of the two binomials.In this case, there are 15 tiles in the product spot, so the two factors must have a total of 15 terms.

However, since there are 0 tiles in both the factor 1 and factor 2 spots, both binomials must have a constant of 0. Therefore, the only possible arrangement for the tiles is: 1 x² tile, 2 x tiles, 4 negative x tiles, and 8 negative tiles.Now, we need to arrange these tiles in the form of a rectangle. The only possible arrangement is a rectangle with a length of 5 tiles (3 columns) and a width of 3 tiles (1 x² tile and 2 x tiles). The 4 negative x tiles are placed below the x² tile, and the 8 negative tiles are placed below the x tiles. This gives the polynomial: x² - 2x - 8.

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The equations [tex]y=2x-3 [/tex]and [tex]y=x+6[/tex],

we can use them to find the point of intersection between the two lines. This point of intersection represents the solution to the system of equations.

Setting the two equations equal to each other, we get:

[tex]2x - 3 = x + 6[/tex]

Simplifying this equation, we can see that x = 9.

Now we can substitute x = 9 into either of the original equations to find the corresponding value of y.

Let's use the equation [tex]y=2x-3[/tex]

[tex]y = 2(9) - 3 = 15[/tex]

Therefore, the solution to the system of equations y=2x-3 and y=x+6 is the point (9, 15).

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The correct statement is:

B. The gummy bear is more likely to be strawberry than orange or raspberry.

What are likely events?

In probability theory, an event is a set of outcomes of an experiment or a random phenomenon. A likely event is an event that has a high probability of occurring

To determine the probability of selecting a gummy bear of a particular flavor, we need to divide the number of gummy bears of that flavor by the total number of gummy bears in the package.

The total number of gummy bears is:

4 + 3 + 8 + 9 + 12 = 36

So the probabilities of selecting a gummy bear of each flavor are:

Pineapple: 4/36 = 1/9

Lemon: 3/36 = 1/12

Raspberry: 8/36 = 2/9

Orange: 9/36 = 1/4

Strawberry: 12/36 = 1/3

Therefore, the correct statement is:

B. The gummy bear is more likely to be strawberry than orange or raspberry.

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The answer of the given question based on equation is the complete equation is: 746 x 34 = 2,984 + 1,023 + 22,462.

A variable is a symbol or letter that represents a value that can change or vary. It is often used to express relationships between quantities or to represent unknown values. Variables are commonly used in algebra, where they are used to represent unknown quantities in equations. Variables can also be used in calculus to represent functions and their derivatives. In statistics, variables are used to represent different types of data, like numerical values or categorical groups.

To solve for the blanks, we can simplify the left side of the equation first:

746 x 34 = 25,444

Then, we can write:

25,444 = 2,984 + 22x + 8

where x represents the first blank and (22x + 8) represents the second blank.

To solve for x, we can subtract 2,984 from both sides of the equation:

25,444 - 2,984 = 22x + 8

22,460 = 22x + 8

Subtracting 8 from both sides of the equation, we get:

22,452 = 22x

Dividing both sides of the equation by 22, we get:

x = 1,023

Therefore, the missing values are 1,023 and 22,462.

So, the complete equation is:

746 x 34 = 2,984 + 1,023 + 22,462.

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The purpose of the study was to determine whether the stress management program had any effects on various health outcomes.

Researchers tested a stress program with 3 groups; treatment groups had fewer illnesses, strokes, lower blood pressure, and emotional outbursts. The researchers conducted an evaluation of a stress management program, in which they randomly assigned subjects to one of three groups: two treatment groups and a control group. The purpose of the study was to determine whether the stress management program had any effects on various health outcomes.

The results of the study indicated that both treatment groups experienced a number of positive health outcomes compared to the control group. Specifically, the treatment groups had fewer illnesses like colds and flu, fewer strokes, a reduction in blood pressure, and reported fewer emotional outbursts.

The findings of this study suggest that a stress management program may have multiple benefits for individuals' health, including reducing the risk of certain illnesses and improving emotional well-being. However, further research is needed to confirm these findings and to determine whether these effects are sustained over time.

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Answer:

x ≈ 16,8

Step-by-step explanation:

Use trigonometry:

[tex] \tan(40°) = \frac{x}{20} [/tex]

Cross-multiply to find x:

[tex]x = 20 \times \tan(40°) ≈16.8[/tex]

the answer's translation.

The overall shape of the distribution is normal.

If the overall shape of the combined distribution for both the class samples and the simulation samples was normal, then it suggests that the individual distributions of the samples were either normally distributed or approximately normally distributed.

A normal distribution, also known as a Gaussian distribution or a bell curve, is a probability distribution that is symmetric and bell-shaped. The normal distribution is commonly used in statistical analysis and modeling because it is often observed in real-world data and has some desirable properties.

When the individual distributions of the samples are combined, their values are added up or averaged, resulting in a larger sample size and a more representative estimate of the underlying distribution. If the individual distributions are normally distributed, then the central limit theorem states that the combined distribution will tend towards normality as the sample size increases. This can explain why the overall shape of the combined distribution for both the class samples and the simulation samples was normal.

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Answer:

Step-by-step explanation:

√4 - 3.14 ; -2/3 ;  √25 + √6 ; Зx3.14

we know that

[tex]\text{[volume of a prism]}=\text{length}\times\text{width}\times\text{height}[/tex]

[tex]\text{length}=1 \dfrac{1}{4} \ \text{cm}\longrightarrow \dfrac{(1\times4+1)}{4} \longrightarrow \dfrac{5}{4} \ \text{cm}[/tex]

[tex]\text{width}=1 \dfrac{1}{2} \ \text{cm}\longrightarrow \dfrac{(1\times2+1)}{2} \longrightarrow \dfrac{3}{2} \ \text{cm}[/tex]

[tex]\text{height}=\dfrac{1}{6} \ \text{cm}[/tex]

[tex]\text{[volume of a prism]}=\huge \text(\dfrac{5}{4}\huge \text{)}\times\dfrac{3}{2} \times\dfrac{1}{6} \implies\dfrac{5}{16} \implies 0.3125 \ cm^3[/tex]

the answer is:

the volume is 0.3125 cm³ (5/16 cm³)

Answer:

any value of x that satisfies the given conditions (i.e., makes the mean of the marks equal to the given value) is a possible score for Esi in the test. For example, if we want the mean to be 80, we can substitute 80 for Mean in the expression above and solve for x.

Step-by-step explanation:

   Expression for the mean of the marks:

   The mean of the marks is the sum of all the marks divided by the number of students. So, for this problem, the expression for the mean is:

Mean = (92 + 85 + 65 + x) / 4

   Linear inequality for the mean being less than 80:

   We can find the mean of the marks using the expression above:

Mean = (92 + 85 + 65 + x) / 4

To write a linear inequality for the mean being less than 80, we can set up the inequality:

(92 + 85 + 65 + x) / 4 < 80

We can then solve for x:

92 + 85 + 65 + x < 320

x < 320 - 92 - 85 - 65

x < 78

Therefore, if Esi scored less than 78 in the test, the mean of the marks would be less than 80.

   Possible marks Esi scored in the test:

   We can use the expression for the mean of the marks to solve for Esi's score. We know that the mean of the marks is:

Mean = (92 + 85 + 65 + x) / 4

And we know that Esi's score is x. So, we can substitute x with Esi's score and solve for it:

(92 + 85 + 65 + Esi) / 4 = Mean

Multiplying both sides by 4:

92 + 85 + 65 + Esi = 4 x Mean

Simplifying:

242 + Esi = 4 x Mean

Substituting Mean with its value:

242 + Esi = 4 x ((92 + 85 + 65 + x) / 4)

Simplifying:

242 + Esi = 92 + 85 + 65 + x

242 + Esi = 242 + x

Subtracting 242 from both sides:

Esi = x

The grocer's gain percentage is 5% after he sells 40 liter of oil for the cost price of 42 liter.

In business and finance, profit is the amount of money earned by a company or an individual after deducting all the expenses and costs associated with producing and selling goods or services. It is essentially the difference between the revenue earned from selling goods or services and the costs incurred in producing and selling those goods or services.

Let's assume that the cost price of 1 liter of oil is $1 for simplicity.

According to the problem, the grocer is selling 40 liters of oil for the cost price of 42 liters. So, his total cost price for 40 liters of oil is 40 * $1 = $40.

However, he is selling 42 liters worth of oil, which means his selling price is 42 * $1 = $42.

Therefore, his profit in this case is $2 (selling price - cost price).

To find his gain percentage, we can use the following formula:

Gain percentage = (Profit / Cost price) x 100

Substituting the values, we get:

Gain percentage = ($2 / $40) x 100 = 5%

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If the total is 153, then the percentage would be of 107 be simply calculated by using the formula as 69.935.

The denominator of a percentage (also known as a ratio or fraction) is always 100. Sam, for instance, would have received 30 out of a possible 100 points if he had received 30% on his maths test. In ratio form, it is expressed as 30:100 and in fraction form as 30/100. In this case, the percentage symbol "%" is interpreted as "percent" or "percentage."

This percent sign may always be changed to a fraction or decimal equivalent by using "divided by 100."

We already have our first value 153 and the second value 107. Let's assume the unknown value is Y which answer we will find out.

As we have all the required values we need, Now we can put them in a simple mathematical formula as below:

STEP 1

Y = 107 / 153

By multiplying both numerator and denominator by 100 we will get:

STEP 2

Y =  107 /153 × 100

= 69.935

STEP 3

Y = 69.935

Finally, we have found the value of Y which is 69.935 and that is our answer.

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Complete question;

If the total is 153, what would be the percentage of 107?

Answer:

Step-by-step explanation:

answer is 0.5

Answer:

m∠1 = 48°

m∠2 = 132°

Step-by-step explanation:

We Know

m∠1 + m∠2 = 180°

Let's solve

(x + 26) + 6x = 180

x + 26 + 6x = 180

7x + 26 = 180

7x = 154

x = 22

Now we put 22 in for x and solve m∠1 and m∠2 !

m∠1 = (x + 26)

m∠1 = 22 + 26

m∠1 = 48°

m∠2 = 6x

m∠2 = 6(22)

m∠2 = 132°

Answer:

438

Step-by-step explanation:

the rate of decay is 438 the decay factor is 999

For given Squares, The area of Shaded region will be 16-x².

What are squares?

In geometry, a square is a two-dimensional shape that has four sides of equal length and four right angles (90-degree angles). Each side of a square is parallel to its opposite side, and the diagonals of a square bisect each other at right angles. The formula for the area of a square is A = s², where A is the area and s is the length of one side.

Now,

As Area of Square= side²

Area of shaded region=Area of Bigger square - Area of White Square

and Side of bigger square=4

Side of White Square = x

Then

A (Area of shaded region) = 4²-x²

A=16 - x²

Hence,

          The area of Shaded region will be 16-x².

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Answer:

n = 12

Step-by-step explanation:

Given equation:

[tex]\dfrac{9}{n}=\dfrac{75}{100}[/tex]

We can solve the equation for the unknown quantity, n, by cross-multiplying, which means multiplying both sides of the equation by the product of the denominators.

The denominator of a fraction is the part below the division bar.

The denominators of the given equation are n and 100, so their product is 100n.

Multiply both sides by 100n:

[tex]\implies \dfrac{9}{n} \cdot 100n=\dfrac{75}{100}\cdot 100n[/tex]

Simplify and cancel the common factors:

[tex]\implies \dfrac{9\cdot 100n}{n} =\dfrac{75\cdot 100n}{100}[/tex]

[tex]\implies 9\cdot 100 =75\cdot n[/tex]

[tex]\implies 900 =75n[/tex]

To solve for n, divide both sides of the equation by 75:

[tex]\implies \dfrac{900}{75} =\dfrac{75n}{75}[/tex]

[tex]\implies 12=n[/tex]

Therefore, the unknown quantity, n, is 12.

Answer:

Step-by-step explanation:

To find:-

Answer:-

The given equation to us is ,

[tex]\longrightarrow \dfrac{9}{n}=\dfrac{75}{100} \\[/tex]

Simplify the RHS of the equation. This can be done by dividing the numerator and denominator by 25 as it is the HCF of 75 and 100 . So we have;

[tex]\longrightarrow \dfrac{9}{n}=\dfrac{75\div 25}{100\div 25} \\[/tex]

Simplify,

[tex]\longrightarrow \dfrac{9}{n} = \dfrac{3}{4} \\[/tex]

Flip the numerator and denominator on both the sides , as ;

[tex]\longrightarrow \dfrac{n}{9} =\dfrac{4}{3} \\[/tex]

Multiply both the sides by 9 as ,

[tex]\longrightarrow \dfrac{n}{9}\times 9 =\dfrac{4}{3}\times 9\\[/tex]

Simplify,

[tex]\longrightarrow \boxed{\boldsymbol{ n = 12}} \\[/tex]

Henceforth the value of n is 12 .