The article "Kids Digital Day: Almost 8 Hours" (USA Today, January 20, 2010) summarized results from a national survey of 2002 Americans age 8 to 18. The sample was selected in a way that was expected to result in a sample representative of Americans in this age group.
a. Of those surveyed, 1321 reported owning a cell phone. Use this information to construct and interpret a 90% confidence interval estimate of the proportion of all Americans age 8 to 18 who own a cell phone.
b. Of those surveyed, 1522 reported owning an MP3 music player. Use this information to construct and interpret a 90% confidence interval estimate of the proportion of all Americans age 8 to 18 who own an MP3 music player.
c. Explain why the confidence interval from Part (b) is narrower than the confidence interval from Part (a) even though the confidence level and the sample size used to compute the two intervals was the same.

Answer:

is $27.50 per each teacket

The sums of the measures of the interior angles of a polygon is three times the sum of its exterior angles then it has 8 sides .

What is Polygon?

A polygon is a two-dimensional, closed form that is flat or planar and is limited by straight sides. Its sides are not curled. A polygon's edges are another name for its sides. The vertices (or corners) of a polygon are the places where two sides converge. Here are some illustrations of polygons.

What is interior angles?

Interior angles are those that are located within the confines of two parallel lines that are intersected by a transversal.

What is exterior angles?

The angles that are created outside of a triangle are its external angles. In other terms, the angle created between one of a triangle's sides and its neighboring extended side is the triangle's external angle.

We know that sum of interior angle of regular polygon is ;

(n-2) x 180°

Where n = no. of sides

We also know that sum of exterior angle of regular polygon is 360°.

The fact that the sum of a polygon's internal angles is three times the sum of its outside angles is now a given;

Therefore;

sum of interior angles of a regular polygon = 3 x sum of exterior angle

⇒ (n-2) x 180°

⇒3 x 360°

Simplify the equation we have above by:

⇒(n-2) = 3 x 360°/180° = 6

⇒ n = 6+2 = 8

Therefore the sides of the regular polygon  is 8.

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The 5 different colorings are possible.

The rectangle is partitioned into 5 regions.

The objective is to find the different of color.

There are 5 rectangle and 5 colors

Each region is to be painted a solid color-red. orange, yellow, blue, or green

Need to color 5 rectangles by using given five colors.

Then, we need to use 5! colors.

The factorial of a whole number is the function that multiplies the number by every natural number below it. Symbolically, a factorial can be represented by using the symbol "!". So, "n factorial" is the product of the first n natural numbers and is represented as n!

The formula for n factorial is:

=5×4×3×2×1

=120

Therefore, the possible colorings are 5.

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The area the polygon in the diagram with, a length from the center to the vertex 6√2 in is 144.0 in².

Any closed curve that consists entirely of connected line segments (sides) without any intersections is known as a polygon in geometry. The three simplest polygons are pentagons, triangles with three sides, and quadrilaterals with four sides (five sides). The two types are concave and convex polygons.

Convex polygons are those without any extended sides crossing over them. Equilateral refers to a polygon with equal sides. Interior angles of equiangular shapes are equal. Every equilateral and equiangular polygon is a regular polygon (e.g., an equilateral triangle or a square).

As all sides are equal, all diagonals are equal too, and the angle of adjacent diagonals are 90° with vertical opposite angle.

Therefore,

Each side = [tex]\sqrt{\text {diagonal}^2+ \text {diagonal}^2}[/tex]

Each side = [tex]\sqrt{(6\sqrt{2} )^2+(6\sqrt{2} )^2}[/tex]

Each side = [tex]\sqrt{(36\times 2+36\times 2}[/tex]

Each side = [tex]\sqrt{144}[/tex]

Each side = 12 inch

Area =  12 × 12

         = 144.0 in²

Thus, the area the polygon in the diagram with, a length from the center to the vertex 6√2 in is 144.0 in².

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The probability that the total weight of the passengers on a full flight exceeds 6000 pounds is about 0.0147 or 1.47%.

What is the Central Limit Theorem?

The Central Limit Theorem states that the sum of a large number of independent and identically distributed random variables is approximately Normally distributed.

(a) The reason why you cannot calculate the probability that a randomly selected passenger weighs more than 200 pounds is that the weight of passengers is not Normally distributed.

The Normal distribution is a symmetric bell-shaped distribution that is defined by its mean and standard deviation.

The weight of passengers is not symmetric and it may not follow a bell shape.

Therefore, we cannot use the Normal distribution to calculate the probability of a weight greater than 200 pounds.

(b) To calculate the probability that the total weight of the passengers on a full flight exceeds 6000 pounds, we can use the Central Limit Theorem.

Since we don't know the exact distribution of the weight of the passengers, we can use the Central Limit Theorem to approximate the total weight of the passengers on a full flight.

The mean weight of a passenger is 190 pounds, and the standard deviation is 35 pounds. Since a full flight carries 30 passengers, the mean weight of the passengers on a full flight is 19030 = 5700 pounds and the standard deviation is 35sqrt(30) = 175 pounds.

To find the probability that the total weight of the passengers on a full flight exceeds 6000 pounds, we can use the standard normal distribution table.

z = (6000 - 5700) / 175 = 2.2857

Probability P(X > 6000) = P(Z > 2.2857) = 1 - P(Z < 2.2857) = 1 - 0.9853 = 0.0147

Hence, the probability that the total weight of the passengers on a full flight exceeds 6000 pounds is about 0.0147 or 1.47%.

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The probability that a randomly chosen appointment is with a patient under 18 years old or is for regular cleaning is 0.95.

The probability of a random appointment being with a patient under 18 or for regular cleaning is calculated as P(Under 18 or Regular Cleaning) = P(Under 18) + P(Regular Cleaning) - P(Under 18 and Regular Cleaning).

P(Under 18) = 0.9

P(Regular Cleaning) = 0.15

P(Under 18 and Regular Cleaning) = 0.14

So, P(Under 18 or Regular Cleaning):

= 0.9 + 0.15 - 0.14

Apply the arithmetic operation, and we get

= 0.91.

Thus, the required probability is 0.91.

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Using simultaneous equations, each small candle costs $1.00 and each large candle costs $5.00.

Simultaneous equations are two or more equations solved concurrently.

Simultaneous equations are also known as a system of equations.

                 Small Candle   Large Candle   Total Cost

You buy             4                       2                    $14

A friend buys    5                       3                   $20

Let the cost of the small candle each = s and the cost of the large candle each = l

Equation 1: 4s + 2l = 14

Equation 2: 5s + 3l = 20

Multiply Equation 1 by 1.5:

Equation 3: 6s + 3l = 21

Subtract Equation 2 from Equation 3:

6s + 3l = 21

-

5s + 3l = 20

s = 1

= $1

From Equation 1:

4s + 2l = 14

4 + 2l = 14

2l = 10

l = 5

= $5

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The distance from G to the nearest point on the circle is going to be 5.61 cm.

The given figure (image attached below) has the segments GA and GB tangent to a circle at A and B, and AGB is at a 48-degree angle. We have been told that GA = 12 cm. We have to find the distance from G to the nearest point on the circle.

For this, first what we need to do is draw radii to A and B. Next draw OG which bisects the 48-angle G into two 24-angles. Let P be the point where OG intersects the circle. This becomes the distance from G to the nearest point on the circle which we need to find (image attached below).

In the right triangle AOG, radius AO is the side opposite angle AGO-

= Tangent = Perpendicular / Base

= tan(24) = r / 12

= r = 12tan(24)            (i)

For OG -

= cos(24) = Base / Hypotenuse = 12 / OG

= OG = 12cos(24)        (ii)

Now, we subtract (i) and (ii) -

= 12tan(24) - 12cos(24)    

= 5.61 cm

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On solving the provided question, we can say that  x = 6 a solution to the equation x + 13 = 18, no, because 6 + 13 = 18 is not true, as 6 + 13 = 19

A mathematical equation is a formula that joins two statements and uses the equal symbol (=) to indicate equality. A mathematical statement that establishes the equality of two mathematical expressions is known as an equation in algebra. For instance, in the equation 3x + 5 = 14, the equal sign places the variables 3x + 5 and 14 apart. The relationship between the two sentences on either side of a letter is described by a mathematical formula. Often, there is only one variable, which also serves as the symbol. for instance, 2x – 4 = 2.

x = 6 a solution to the equation x + 13 = 18

No, because 6 + 13 = 18 is not true, as 6 + 13 = 19

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$75668.4 is the interest earned in 6 months.

percentage, a relative value indicating hundredth parts of any quantity.

Tom has $84,076 in a savings account that earns 15% annually.

The interest is not compounded.

We have to find the interest he earned in 6 months.

Use the formula i = prt,

where i is the interest earned,

p is the principal (starting amount),

r is the interest rate expressed as a decimal,

and t is the time in years.

i=84076×15/100×6

=84076×0.15×6

=$75668

Hence, $75668.4 is the interest earned in 6 months.

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Answer: [tex]m\angle YOZ, m\angle VOS, m\angle UOZ, m\angle XOS, m\angle TOZ[/tex]

Step-by-step explanation:

[tex]m\angle VOS=90^{\circ}\\\\m\angle UOZ=180^{\circ}-56^{\circ}=124^{\circ}\\\\m\angle YOZ=180^{\circ}-143^{\circ}=37^{\circ}\\\\m\angle XOS=126^{\circ}\\\\m\angle TOZ=180^{\circ}-33^{\circ}=147^{\circ}[/tex]

The probability of picking a 2 and then picking a 1 would be = 1/2

Probability is definitely as the expression that to represents the number of outcomes of an event.

The number of cards such as 1,2,3,4 = 4 cards.

The cards picked at random = a 1 and a 2

Therefore, the probability = 2/4 = 1/2

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Answer:

  $3213

Step-by-step explanation:

You want to know the total spent on rent and food if rent is 7/20 of your budget and food is 1/2 of your budget of $3780 per month.

The amount spent on each item is the product of the fraction of the budget it is and the total amount being budgeted (your income).

  rent = 7/20 × 3780 = 1323

  food = 1/2 × 3780 = 1890

The total spent on these items is the sum of these amounts:

  rent + food = 1323 +1890 = 3213

A total of $3213 is budgeted for rent and food.

__

Additional comment

Your calculator can figure this handily.

You can factor out the income amount and add the fractions first:

  (7/20·3780) +(1/2·3780) = 3780(7/20 +1/2) = 3780(7/20 +10/20)

  = 3780(17/20) = 3213

Answer:

answer is d

Step-by-step explanation:

You need to find the four constants, a, b, c, and d. At x = -1000, you have a value for f(x).

A)Outline it:

f(-1000) = -1000 = a (-1000)^3 b(-1000)^2 + c (-1000) + d

At x = 1000, you have a value for f(x).

B)Outline it:

f(+1000) = a (1000)^3 + b (1000)^2 + c (1000) + d

You know the slope's value, f'(x), and when x = -1000, f'(-1000) equals 3 a (-1000)2 + 2 b (-1000) + c.

At x = + 1000 f'(1000), you have a value for the slope: 3 a (1000)2 + 2 b (1000) + c

C) That is four linear equations with a, b, c, and d as the four unknowns.

When you simultaneously solve all four equations, you will get the function and its derivative, which you may graph.

D) The steepest part is where the derivative's absolute value is at its highest.

You can find that extreme by setting the derivative of the derivative equal to zero.

6 a x + 2 b = 0

solve for x and calculate the slope at that point.

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The sample variance of the given data 13,11,15,2,9,14 is 356.6.

Sample variance can be defined as the expectation of the squared difference of data points from the mean of the data set. It is an absolute measure of dispersion and is used to check the deviation of data points with respect to the data's average.

we have data 13, 11, 5, 2, 9, 14, and we have to determine the sample variance of given data.

Sample variance is given by,

[tex]S^2=\frac{\sum^n_1(X_i-X')^2}{(n-1)}[/tex]

where X' is the sample mean,

the mean of given data is,

[tex]X'=\frac{(13+11+5+2+9+14)}{6} \\\\X'=\frac{54}{6} \\\\X'=9[/tex]

now the sample variance is given by,

[tex]S^2=\frac{(13+9)^2+(11+9)^2+(5+9)^2+(9+9)^2+(14+9)^2}{6-1} \\\\S^2=\frac{(484+400+289+81+529)}{5} \\\\S^2=356.6[/tex]

Hence the sample variance is 356.6.

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This sequence converges to e. The sequence (1 + 2/n)^n is a geometric sequence in which each successive term is found by multiplying the previous term by a constant.

This sequence is an example of a geometric sequence where each successive term is found by multiplying the previous term by a constant. In this case, the constant is equal to (1 + 2/n).

By using the limit definition of a geometric sequence, we can see that the limit of this sequence is given by lim n→∞ (1 + 2/n)^n = e. Therefore, the sequence converges to e.

The sequence (1 + 2/n)^n converges to e.

The sequence (1 + 2/n)^n is a geometric sequence in which each successive term is found by multiplying the previous term by a constant. By using the limit definition of a geometric sequence, it can be determined that the limit of this sequence is given by lim n→∞ (1 + 2/n)^n = e. As a result, the sequence converges to e.

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Answer:ts line is pulled taut and casts a 15 ft - shadow. Find the length of the line. If necessary, round your answer to the nearest tenth.

Step-by-step explanation:

The Riemann sum formula is ∫(1,5) 2x = 24

From the question, we have the following parameters that can be used in our computation:

f(x) = 2x over the interval [1, 5]

The Riemann sum for f(x) = 2x over the interval [1,5] using the right-hand endpoint for each subinterval is given by the formula:

(Δx/2) * (2c1 + 2c2 + ... + 2cn) where c1, c2, ..., cn are the right-hand endpoints of the subintervals and Δx = (b - a)/n.

As a general rule:

As n approaches infinity, the width of the subintervals approaches zero,

Also, we have the Riemann sum approaches the definite integral of f(x) = 2x over the interval [1,5], which is x² evaluated at the interval's endpoints.

So, the formula becomes

∫(1,5) 2x = x²

Substitute the intervals

∫(1,5) 2x = 5² - 1²

Evaluate

∫(1,5) 2x = 24

Hence, the formula is ∫(1,5) 2x = 24

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4x⁴ +12x³ +15x² +9x −6 is the expression which can represent function f(g(x)). Thus, option D is correct.

A rule that transforms one number into another is called a function. However, not every rule outlines an appropriate function. In addition to introducing some of the mathematical terms related to functions, this unit explains how to determine if a given rule describes a valid function.

Given

f(x) = x² + 3x - 6

g(x) = 2x² +3x

To find expression for f(g(x))

Put the value of g(x) place of x, f(x)

f(x) = x² + 3x - 6

(2x² +3x)² + 3(2x² +3x) - 6

4x⁴ +12x³ +15x² +9x −6

Thus, 4x⁴ +12x³ +15x² +9x −6 is the expression which can represent f(g(x)).

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A triangle's third side must always be between (but not exactly equal to) the other two sides' total and difference in length. Take the numbers 2, 6, and 7 as an example. In light of this, the third side length must be more than 4 and lower than 8.

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The number that goes in the box is 4, since 4 + (-2) = 2, which is the coefficient of x^2 in the equation. The third step is to add the same number to both sides of the equation, so the box needs to contain 4.

To complete the third step in solving a quadratic equation using the completing the square method, the number that goes in the box is 4. This is because the goal is to make the coefficient of x^2 on the left side of the equation equal to the coefficient of x^2 on the right side. The equation is x^2 - 8x + 2 = 0, so the coefficient of x^2 on the left side is 1, and the coefficient of x^2 on the right side is 2. Therefore, the number that needs to be added to the left side is 1, and the number that needs to be added to the right side is also 1. This means that 4 needs to be added to both sides of the equation, so 4 is the number that goes in the box.

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The value of c according to the given equation as described is; -14.

The other root of the equation in discuss is; 7.

As evident in the task content; if -2 is the root of a quadratic equation x²-5x+c=0, then x = -2 holds true for the equation; therefore, we have;

a). (-2)² - 5 (-2) + c = 0

4 + 10 + c = 0

c = -14

Hence, the value of c is; -14.

b). By substituting into the equation; we have;

x² - 5x - 14 = 0

(x - 7) (x + 2) = 0

x = 7 OR x = -2.

Therefore, the other root of the equation is; 7.

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[tex]Answer:\ \boxed{96\pi }\ cm^2[/tex]

Step-by-step explanation:

[tex]R=6\ cm \ \ \ \ V_c=72\pi \ cm^3\ \ \ \ S_c=?[/tex]

[tex]V_c=\pi R^2H\\[/tex]

[tex]72\pi =\pi 6^2H\\\\72=36H\\[/tex]

Divide both parts of the equation by 36:

[tex]2=H\\\\Thus,\ H=2\ cm[/tex]

[tex]S_c=2(\pi R^2)+2\pi R(H)\\\\S_c=2\pi (6^2)+2\pi 6(2)\\\\S_c=2\pi(36)+12\pi (2) \\\\S_c=72\pi +24\pi \\\\S_c=96\pi\ cm^2[/tex]

Option(c) is the correct answer i.e. the scale factor of the given triangle is 4/9.

What is Scale factor?

The ratio of the scale of an original thing to a new object that is a representation of it but of a different size is known as a scale factor.

Let's take the measurement of one side of the original triangle and dashed triangle.

The side of Original triangle is 18 units and,

The side of dashed(new) triangle is 8 units

We know that,

Scale factor = dimension of new figure ÷ dimension of original figure

                    = 8 units / 18 units

                   = 4/9.

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Answer:

Rs. 94

Step-by-step explanation:

We will denote the almirahs as A1 and A2 for ease of explanation. I am omitting currency until the final answer

For the following computations note that x% = x/100 in decimal so
15% = 15/100 = 0.15
13 1/3% = 13 1/3 ÷ 100 = 40/3 ÷ 100 = 40/300

Cost of A1 = 4800

A1 was sold for a loss of 15%

Loss = 15% of 3640 = 0.15 x 3640  = Rs 546

A2 bought at 4800 was sold at a gain of 13 1/3%

Gain from sale = 13 1/3% of 4800 = 40/300 x 4800 =Rs 640

We have to treat gain as positive and loss as negative to arrive at the answer

Net gain/loss = 640  - 546 = Rs. 94

Step-by-step explanation:

                            The equation of the ellipse  

                                       [tex]\displaystyle\\\boxed {\frac{x^2}{a^2} +\frac{y^2}{b^2} =1}[/tex]

                                         [tex]F^2=a^2-b^2[/tex]

Given: F₁(-4,0)    F₂(4,0)    b₁(0,-3)     b₂=(0,3)

[tex]\displaystyle\\a^2=F^2+b^2\\\\a^2=4^2+3^2\\\\a^2=16+9\\\\a^2=25\\\\a_{1,2}=б5\\\\So,\ a_1(-5,0)\ \ \ \ a_2(5,0)\\\\Thus,\ \frac{x^}{(б5)^2} +\frac{y^2}{(б3)^2} =1\\\\\frac{x^2}{25}+\frac{y^2}{9} =1\ \ \ \ -\ the\ equation \ of\ the\ ellipse[/tex]

After examine the number line,and then the correct symbol to complete each statement is -2/4<-1/4; 3/4>2/4;-1/4<0.

What is Number line ?

A number line is a diagram of a graduated straight line used to represent real numbers in introductory mathematics. It is assumed that every point on a number line corresponds to a real number, and that every real number corresponds to a point.

What is Symbol?

A mark, sign, or term that denotes, denotes, or is taken to denote an idea, an item, or a relationship is known as a symbol. By connecting seemingly unrelated ideas and events, symbols help people look beyond the known and the visible.

In the question given some relation between the real number which are

a) -2/4 < -1/4 because negative number has the property that the those numbers which is smaller is always greater.

b) 3/4 > 2/4 both numbers are positive so clearly it 3/4 comes after 2/4 so it is greater.

c)  -1/4 < 0 zero is always greater than the negative numbers

So, after examine the number line,and then the correct symbol to complete each statement is -2/4<-1/4; 3/4>2/4;-1/4<0.

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Since the input value of domain -4 has two different output values (7 and 6), the relation is not a function.

By definition, a relation is a function if each input value has only one output value.

Given the relation:

(-4,6)

(-4,7)

(6,5)

(7,9)

The domain is the set of the x-coordinates of each ordered pair (You do not need to write 4 twice):

domain ={-4 ,6,5}

The range is the set of the y-coordinates of each ordered pair :

range=  {6,7,5,9}

Since the input value 4 has two different output values (7 and 6), the relation is not a function.

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Answer: 11/1000 o 1.1%

Step-by-step explanation:

11 ÷ 1000

0.011

11/1000 o 1.1%