Find the indicated confidence interval. Assume the standard error comes from a bootstrap distribution that is approximately normally distributed.

Answer:

CD = 4 , AD = 6

Step-by-step explanation:

AC is an angle bisector of ∠ BAD and divides the opposite side from the angle into segments that are proportional to the other two sides, that is

[tex]\frac{BC}{CD}[/tex] = [tex]\frac{AB}{AD}[/tex] ( substitute values )

[tex]\frac{6}{y-1}[/tex] = [tex]\frac{9}{2y-4}[/tex] ( cross- multiply )

6(2y - 4) = 9(y - 1) ← distribute parenthesis

12y - 24 = 9y - 9 ( subtract 9y from both sides )

3y - 24 = - 9 ( add 24 to both sides )

3y = 15 ( divide both sides by 3 )

y = 5

Then

CD = y - 1 = 5 - 1 = 4

AD = 2y - 4 = 2(5) - 4 = 10 - 4 = 6

7(x-2) - 2(x-3)

= 7x - 14 - 2x + 6   // Distribute the coefficients

= 5x - 8  // Combine like terms and simplify

Therefore, 7(x-2) - 2(x-3) simplifies to 5x - 8.

Answer:

7(x-2) - 2(x-3) simplifies to 5x - 8.

Step-by-step explanation:

To expand and simplify 7(x-2) - 2(x-3), we can use the distributive property and simplify the resulting expression.

7(x-2) - 2(x-3) = 7x - 14 - 2x + 6

Combining like terms, we get:

= (7x - 2x) + (-14 + 6)

= 5x - 8

Therefore, 7(x-2) - 2(x-3) simplifies to 5x - 8.

Let's call the two numbers we're trying to find x and y. We know that x + y = 12 and xy = 23. From the first equation, we can solve for one of the variables in terms of the other. So if we subtract x from both sides, we get y = 12 - x. Now we can substitute this expression for y into the second equation to get x(12 - x) = 23. Expanding this out, we get 12x - x^2 = 23. Rearranging, we get x^2 - 12x + 23 = 0. This quadratic equation can be factored as (x - 2)(x - 10) = 0. So either x = 2 and y = 10, or x = 10 and y = 2.

Answer:

The two numbers are 2 and 10.

Answer:

There are a total of 900 three-digit positive integers, from 100 to 999.

The number of students are as follows:

To find the number of students who read comics and novels only:

Let novel and textbook = x

Let textbook and comics = y

Let comic and novel = z

y + x = 11 --- (1)

y + z = 10 --- (2)

x + z = 13 --- (3)

Make y subject of the formula in (2)

y = 10 - z

substitute for y in (1)

10 - z + x = 11 --- (4)

solve (3) and (4) simultaneously by addition

10 - z + x + x + z = 11 + 13

2x = 24 - 10

x = 7

y = 11 - 7

y = 3

z  = 13 - 7

z = 4

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Answer:

$8.92 each

Step-by-step explanation:

The correct terms in the expression are,

⇒ 3x and 5x

We have to given that;

The quadratic equation is,

⇒ 15x² + x - 2 = (? - 1) (? + 2)

Now, We can simplify as;

⇒ 15x² + x - 2

⇒ 15x² + 6x - 5x - 2

⇒ 3x (5x + 2) - 1 (5x + 2)

⇒ (3x - 1) (5x + 2)

Thus, The correct terms in the expression are,

⇒ 3x and 5x

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The value of distance between two points on graph is,

⇒ d = √32 units

We have to given that;

The coordinates of two points are,

⇒ (9, - 4) and (5, -8)

We know that;

The distance between two points (x₁ , y₁) and (x₂, y₂) is,

⇒ d = √ (x₂ - x₁)² + (y₂ - y₁)²

Hence, The value of distance between two points on graph is,

⇒ d = √ (x₂ - x₁)² + (y₂ - y₁)²

⇒ d = √ (5 - 9)² + (- 8 - (-4))²

⇒ d = √ 16 + 16

⇒ d = √32

Thus, The value of distance between two points on graph is,

⇒ d = √32 units

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The coordinate of the point after transformation is: (3, -4)

The coordinate initially is given as (0, -4).

Moving one unit to the left means a deduction of 1 unit from the x coordinate to get:

(0 - 1, -4)

= (-1, -4)

Moving by 4 units to the right means an addition of 4 units to x coordinate to get:

(-1 + 4, -4)

= (3, -4)

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The simplification of the fractions given above through multiplication would be;

1.) 9 11/12

2.) 11 19/40

For question 1.)

2 5/6 × 3 2/4

Change the mixed fraction to single fraction;

= 17/6 × 14/4

= 17/6 × 7/2

= 119/12

= 9 11/12

For question 2.)

5 2/5 × 2 1/8

= 27/5 × 17/8

= 459/40

= 11 19/40

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y = x + 2 represents the correct equation for the situation.

Option D is the correct answer.

We have,

The problem states that the number of miles the runner runs this week (y) will be 2 more than the number of miles she ran last week (x).

We can express this relationship using the equation:

y = x + 2

This equation means that if we know the number of miles the runner ran last week (x), we can find the number of miles she runs this week (y) by adding 2.

Thus,

y = x + 2 represents the correct equation for the situation.

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The scale factor will be one-third which is 1/3. Then the correct option is A.

Given that:

Dimension of a small triangle, 6, 8, and 10

Dimension of a giant triangle, 18, 24, and 30

Dilation is the process of increasing the size of an item without affecting its form. The object's size can be raised or lowered depending on the scale factor. There is no effect of dilation on the angle.

The scale factor is calculated as,

SF = 6 / 18

SF = 1 / 3

The scale factor will be one-third which is 1/3. Then the correct option is A.

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Answer:

1/3

Step-by-step explanation:

I took the test!

The solution to all parts from a to f is shown below.

A) Matrix A:

[ 2  -3 ]

[ 4   3 ]

B) The determinant of matrix A is:

det(A) = (2*3) - (-3*4) = 6 + 12 = 18

C) Matrix X:

[ -8  -3 ]

[ -34  3 ]

D) The determinant of matrix X is:

det(X) = (-8*3) - (-3*-34) = -24 - 102 = -126

E) Matrix Y:

[ 2  -8 ]

[ 4  -34 ]

F) The determinant of matrix Y is:

det(Y) = 2(-34) - (-8) (4) = -68 + 32 = -36

G) Using Cramer's rule, we can solve for x and y as follows:

x = det(X) / det(A) = -126 / 18 = -7

y = det(Y) / det(A) = -36 / 18 = -2

Therefore, the solution to the system is (-7, -2).

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Answer:

The greatest area enclosed by the fence will be a square. If the farmer has 60 metres of perimeter fencing, he can use 15 meters of fencing for each side of the square. This would give him an area of 15² = 225 m². Since he can keep one chicken for every square meter, he can keep 225 chickens. Therefore, the farmer should arrange his fence in the shape of a square to get the greatest area.

Answer:

Confidence Interval = (1.41, 1.59)

Step-by-step explanation:

To construct a confidence interval for the population mean, we can use the following formula:

Confidence Interval = sample mean ± (margin of error * standard error)

where the standard error is equal to the standard deviation divided by the square root of the sample size.

Given the information provided, we can calculate the standard error as:

standard error = 2.16 / sqrt(1370) = 0.058

Then, we can calculate the margin of error as 0.12.

Substituting these values into the formula, we get:

Confidence Interval = 1.5 ± (0.12 * 0.058)

Confidence Interval = (1.41, 1.59)

Therefore, we can interpret the 95% confidence interval as follows: we are 95% confident that the true population mean of the number of days that people feel lonely in the past 7 days is between 1.41 and 1.59. This means that if we were to take many samples of 1370 subjects and compute the confidence intervals for each sample using the same method, we would expect about 95% of the intervals to contain the true population mean.

The surface area of the prism for the given dimensions is equal to option B. 180 square centimeters.

Surface area of the prism

= Area of two right triangles + Area of rectangle 1 + Area of rectangle 2 + Area of the rectangle3

In a Triangle ,

Base = 12cm

height = 5cm

Area of the triangle = ( 1/2 ) × base × height

                                 = (1/2)× 12 × 5

                                 = 30 cm²

Length of rectangle 1 = 12cm

Width of rectangle 1 = 4cm

Area of rectangle 1 = 12 × 4

                                = 48 cm²

Length of rectangle2= 13cm

Width of rectangle 2 = 4cm

Area of rectangle 2= 13 × 4

                                = 52 cm²

Length of rectangle 3 = 5cm

Width of rectangle 3 = 4cm

Area of rectangle 3 = 5 × 4

                                = 20 cm²

Surface area of the prism

= Area of two right triangles + Area of rectangle 1 + Area of rectangle 2 + Area of the rectangle3

Substitute the values of the area we have,

⇒ Surface area of the prism  = 2(30 ) + 48 + 52 + 20

⇒ Surface area of the prism  =  180 square centimeters

Therefore, the surface area of the prism is equal to option B. 180 square centimeters.

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Answer: x ≥ 3

Step-by-step explanation:

Step-by-step explanation:

[tex] \frac{2x}{3} = \frac{4}{9} \\ 2x \times 9 = 4 \times 3 \\ 18x = 12 \\ x = \frac{12}{18} \\ x = \frac{2}{3} [/tex]

x=2/3

I hope it helped you

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The verification of given segments in a triangle are parallel is as follow,

In triangle ABE, AC/ CE = BD/DE  are in proportion ⇒ CD || AB.

In triangle RVS, VT/TR = VU/US  are in proportion ⇒ UT || SR.

In the triangle ABE,

CD is the line segment divides AE and BE into equal parts.

AC = 1.5

CE = 1.5

BD = 1.5

DE = 1.5

AC/ CE = BD/DE

Line divides the two adjacent sides of a triangle are in proportion.

This implies ,

CD is parallel to AB.

In triangle RVS,

VT /TR = 90 /72

⇒VT /TR = 1.25

VU/US = 67.5/54

⇒VU/US = 1.25

This implies ,

VT/TR = VU/US are in proportion.

Hence , triangle proportionality theorem UT is parallel to RS.

Therefore, using triangle proportionality theorem in both the triangle that is,,

In triangle ABE , CD is parallel to  AB and in triangle RVS , UT || RS.

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The length of cable in the coil that weighs 5 1/2 kilograms is 1/2 meter.

Let x be the length of cable in meters that weighs 5 1/2 kilograms.

Then, we can write:

1 meter / (75/1000) kilograms = x meters / 5.5 kilograms

Simplifying the left side, we get:

1 meter / (75/1000) kilograms = 1000 / 75 meters/kilogram

= 40/3 meters/kilogram

Substituting this into our proportion, we get:

40/3 meters/kilogram * x meters = 5.5 kilograms

Multiplying both sides by 3/40, we get:

x meters = (5.5 kilograms) * (3/40) * (40/3 meters/kilogram)

               = 1/2 meter

The length is 1/2 meter

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Answer:

x = 99

Step-by-step explanation:

Since x is on a straight line the adjacent angle and x must equal 180. We will call this adjacent angle B. The angle to the right of B also is on a straight line.

So,

180 - 123 = the inside angle             Simplify

57

The addition of a triangles interior angles equals 180

180 = 42 + 57 + B                              Move variables to one side

180 - (42 + 57) = B                             Simplify

81 = B

Now we can solve for X

180 - 81 = x                                        Simplify

99

The Taylor series for f(x) = e^2x at x = 1 is option D. Σ2ⁿ e²ˣ/n! (x - 1)ⁿ

The Taylor series for a function f(x) centered at x = a is given by:

f(x) = f(a) + f'(a)(x-a)/1! + f''(a)(x-a)^2/2! + f'''(a)(x-a)^3/3! + ...

f'(a), f''(a), f'''(a), ... depict the first, second, third, and higher derivatives of f(x) evaluated at x = a.

In this case:

f(x) = e^(2x)

The first derivative is:

f'(x) = 2e^(2x)

The second derivative is:

f''(x) = 4e^(2x)

The third derivative is:

f'''(x) = 8e^(2x) etc.

Finding the Taylor series for f(x) = e^(2x) at x = 1, evaluate each derivative at x = 1:

f(1) = e^(2)

f'(1) = 2e^(2)

f''(1) = 4e^(2)

f'''(1) = 8e^(2) etc.

Plug these values into the Taylor series formula:

f(x) = f(1) + f'(1)(x-1)/1! + f''(1)(x-1)^2/2! + f'''(1)(x-1)^3/3! + ...

f(x) = e^(2) + 2e^(2)(x-1)/1! + 4e^(2)(x-1)^2/2! + 8e^(2)(x-1)^3/3! + ...

Simplify:

f(x) = e^(2) + 2e^(2)(x-1) + 2e^(2)(x-1)^2 + 4e^(2)(x-1)^3/3 + ...

Therefore, the Taylor series for f(x) = e^(2x) at x = 1 is: Σ2ⁿ e²ˣ/n! (x - 1)ⁿ which is option D.

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Answer:

A rhombus has four congruent sides.

The diagonals of a rhombus bisect each other and form right angles.

From these:

[tex] {(2y})^{2} + {2}^{2} = {(3y - 2)}^{2} [/tex]

[tex]4 {y}^{2} + 4 = 9 {y}^{2} - 12y + 4[/tex]

[tex]5 {y}^{2} - 12y = 0[/tex]

[tex]5y - 12 = 0[/tex]

[tex]5y = 12[/tex]

[tex]y = 2.4[/tex]

Answer:

y=2.4

Step-by-step explanation:

We know that a rhombus has 4 equal sides, and 2 diagonals which bisect eachother at an angle of 90 degrees.

Simply saying, a rhombus is made up of 4 right angled triangles.

If QR is 3y-2, that means that each other side must be 3y-2 aswell, which means that SQ is also 3y-2

Now we can use the pythagorean theorem to solve for y, given that the base is 2 (length of QU), the height is 2y (length of SU), and the hypotenuse is 3y-2 (length of SQ)

(3y-2)²=2²+2y² (Expand using binomial formula)

9y²-12y+4=4+4y² (Collect similar terms)

5y²-12y=0 (Factor the expression)

y(5y-12)=0

We know that if a product of 2 factors is 0, atleast one must also be 0

So we have to make both factors equal 0

y=0

5y-12=0

5y=12

y=12/5, or 2.4

We see that 2.4 is the only possible solution.

Hope this helps!

Answer:

49

Step-by-step explanation:

[tex]\int\limits^{12}_0 {-0.002t^{2} +0.7t} \, dt \\=(-0.002\frac{{12}^{3} }{3} )+(0.7\frac{{12}^{2} }{2} )\\-(-0.002\frac{{0}^{3} }{3} )-(0.7\frac{{0}^{2} }{2} )\\\\=(-0.002\frac{{12}^{3} }{3} )+(0.7\frac{{12}^{2} }{2} )-0-0\\\\=49.248\\[/tex]

The missing side lengths for triangle ABC are 4, 4√3, and 8.

Based on the given information, it seems that the triangle is a right-angled triangle with angles of 30°, 60°, and 90°. Let's find the missing side lengths for triangle ABC using the given lengths and angles.
Identify the triangle type.
Since we have angles of 30°, 60°, and 90°, we are working with a 30-60-90 right-angled triangle.
Determine the ratio of side lengths.
In a 30-60-90 triangle, the ratio of the sides is 1:√3:2.
Find the corresponding side lengths.
Using the given lengths and the 1:√3:2 ratio, we can determine the side lengths for triangle ABC:
- If the shortest side (opposite the 30° angle) is 4, then the other sides would be 4√3 (opposite the 60° angle) and 8 (hypotenuse, opposite the 90° angle).

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The measure of the angle of the triangle ∠BCD = 13°

Given data ,

Let the triangle be represented as ΔBCD

Now , in triangle BCD, we are given the following angle measurements:

angle CDE = (9x - 12)°

angle BCD = (2x + 3)°

angle DBC = (3x + 5)°

From the exterior angle theorem , we get

∠CDE = ∠BCD + ∠DBC

On simplifying , we get

9x - 12 = 2x + 3 + 3x + 5

9x - 12 = 5x + 8

Subtracting 5x on both sides and adding 12 , we get

4x = 20

Divide by 4 on both sides , we get

x = 5

So , the measure of angle ∠BCD = 2(5) + 3

m∠BCD = 13°

Hence , the angle is m∠BCD = 13°

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The complete question is attached below :

In triangle BCD , BD is extended through point D to point E , ∠CDE = ( 9x - 12 )° , ∠BCD = ( 2x + 3 )°, and ∠DBC = ( 3x + 5 )°, find ∠BCD

The slope of the tangent line is:

a = (df(x1)/dx)

The slope of the normal one is:

a' = -1/(df(x1)/dx)

For any function y = f(x), we define the slope of the tangent line at the point x as the derivative evaluated in x.

So if we want to find the slope of the tangent line at the point (x1, y1), we just need to differentiate and evaluate in x1, then the slope will be given by:

df(x1)/dx

And the normal slope is the slope of the perpendicular line, two slopes are perpendicular if the product is -1, then:

a*(df(x1)/dx) = -1

a = -1/(df(x1)/dx)

Where df/dx reffers to the derivative of f(x).

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The total length of the nylon rope that Jamie will use would be 15.3 feet of nylon rope.

Within this scenario specifically, one side of the right-angled triangle comprises the height of the tent (standing at 6.5-feet), and the other forms as the measure from the center of the tent to where Jaime stakes the ropes stretching outwards in another direction (with a calculated measure of 4-feet). Subsequently, we will refer to the extent of the nylon rope as R.

The Pythagorean theorem formula is:

R ² = 6.5 ² + 4 ²

R ² = 42. ²25 + 16

R ² = 58.25

R = 7. 63 ft

There are two ropes so the length would be :

= 7. 63 + 7. 63

= 15. 3 ft

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The height of the pyramid is 30.14 in

We have,

Using the Pythagorean theorem,

Hypotenuse = 32.6 in

Base = 24.8/2 = 12.4 in

Height = x

Now,

32.6² = 12.4² + x²

x² = 1062.76 - 153.76

x² = 909

x = 30.15

Thus,'

The height of the pyramid is 30.14 in

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