what is negative 7 minus negative 2

You can infer causality from a correlational result, but only when the r value is greater than:

C. 1

Causality refers to a situation in which one event causes another. When there is a correlation between two variables, it means that they tend to move in the same direction.

However, this does not necessarily mean that one event causes the other. In order for a correlation to indicate causality, the correlation coefficient (r) must be greater than 1. If the correlation coefficient is below 1, then there is not enough evidence to suggest that one event causes the other.

In addition, there are other factors that need to be considered when assessing causality from a correlational result.

For example, the strength of the relationship between the variables, the direction of the relationship, and the consistency of the results over time. It is also important to consider the context in which the research was conducted, as this may have an effect on the results.

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Answer: 1/6

Step-by-step explanation:

A cube for example a die has numbers 1, 2, 3, 4, 5 and 6 on its faces. The odds of rolling a 5 on a standard number cube is one out of 6 since there are possible six outcomes.

Therefore, the correct answer will be 1/6.

Answer:

1/6

Step-by-step explanation:

Answer:

sorry it took long, got a bit distracted.

Answer:

hey work backwards then you will get the answer i can seem to get it

Step-by-step explanation:

The best description of the transformation for the image being projected on the retina is A. A dilation with a scale factor between 0 and - 1 and center at the nodal point.

An mage is inverted and reversed as it passes through the lens of the eye, and is then projected upside down and reversed onto the retina. The process of transforming the image is called "rectification."

In mathematical terms, a dilation would have taken place because the object was shrunken by the eyes at the nodal point. When an object shrinks , then the scale factor is between 0 and 1 but because this image is inverted, the scale factor is between 0 and - 1.

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Answer:

The factors are,

x + 12 and x - 2

Step-by-step explanation:

x^2 + 10x - 24,

Here, we note that,

12 - 2 = 10,

and (12)(-2) = 24,

so, we  can re-write 10x as 10x = 12x - 2x

so,

\(x^2 + 12x - 2x - 24 = 0\)

Taking x common from the 1st two terms (x^2 and 12x),

and taking -2 common from the last two tems (-2x and -24), we get,

\(x^2 + 12x - 2x - 24 \\x(x+12)-2(x+12)\\taking \ (x+12) \ common,we \ get,\\(x+12)(x-2)\)

So, The factors are,

x + 12 and x - 2

Answer:

Below

Step-by-step explanation:

100t = 1491.48     divide both sides of the equation by 100 to get

t = 14.9148        round

t = 14. 91

Answer:

t = 14. 91

Step-by-step explanation:

Answer:

x = –1

Step-by-step explanation:

From the question given above, the following data were obtained:

y = √(–2x + 7)

y = 3

x =?

The value of x can be obtained as follow:

y = √(–2x + 7)

3 = √(–2x + 7)

Take the square of both side

3² = –2x + 7

9 = –2x + 7

Collect like terms

9 – 7 = –2x

2 = –2x

Divide both side by –2

x = 2 / –2

x = –1

Here, we are given that icing covers the outlining of a circular cake, and given this we are asked to find how much icing is required to cover the whole top of the cake.

In mathematical terms, the outlining of a circle is known as the circumference and the space covering the surface of a circle is known as the area.

In other words, given the circumference of a circle we are asked to find the area.

The area of a circle is equal to πr² where r = radius.

In order to find the area we must have the length of the radius, which is not given. This means we must find it. To do so we can inversely solve for radius using the circumference formula.  

Here, the given circumference is 25.12 and Circumference = 2πr (where r = radius)

Finding the radius

C = 2πr

==> plug in C = 25.12

25.12 = 2πr

==> divide both sides by 2

12.56 = πr

==> divide both sides by π (3.14)

4 = r

So the radius of the circle is 4. We can now find the area.

Finding the area

Area of a circle = πr²

==> plug in r = 4

A = π(4)²

==> evaluate exponent

A = π(16)

==> simplify

A = 50.24

50.24 in² of icing is required to cover the entire top of the cake.

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Main Answer:The linear combination of v = (13/14)u1 + (2/7)u2 + (47/14)u3  

Supporting Question and Answer:

How can we express a vector as a linear combination of  vectors using a system of equations?

To express a vector as a linear combination of  vectors using a system of equations, we need to find the coefficients that multiply each given vector to obtain the desired vector. This can be done by setting up a system of equations, where each equation corresponds to the components of the vectors involved.

Body of the Solution:

(a) To show that the vectors u1 = (2, 0, 3), u2 = (-3, 0, 2), and u3 = (0, 7, 0) form an orthogonal basis for R^3, we need to demonstrate two conditions: orthogonality and linear independence.

u1 · u2 = (2)(-3) + (0)(0) + (3)(2) = -6 + 0 + 6 = 0

u1 · u3 = (2)(0) + (0)(7) + (3)(0) = 0 + 0 + 0 = 0

u2 · u3 = (-3)(0) + (0)(7) + (2)(0) = 0 + 0 + 0 = 0

Since the dot product of every pair of vectors is zero, they are orthogonal.

   2.Linear Independence: We need to show that the vectors u1, u2, and u3 are linearly independent, meaning that no vector can be written as a linear combination of the other vectors.

We can determine linear independence by forming a matrix with the vectors as its columns and performing row operations to check if the matrix can be reduced to the identity matrix.

[A | I] = [u1 | u2 | u3 | I] =

[2 -3 0 | 1 0 0]

[0 0 7 | 0 1 0]

[3 2 0 | 0 0 1]

Performing row operations:

R3 - (3/2)R1 -> R3

R1 <-> R2

[1 0 0 | -3/2 1 0]

[0 1 0 | 0 1 0]

[0 0 7 | 0 0 1]

Since we can obtain the identity matrix on the left side, the vectors u1, u2, and u3 are linearly independent.

Therefore, the vectors u1 = (2, 0, 3), u2 = (-3, 0, 2), and u3 = (0, 7, 0) form an orthogonal basis for R^3.

(b) To write v = (1, 2, 3) as a linear combination of u1, u2, and u3, we need to find the coefficients x, y, and z such that:

v = xu1 + yu2 + z*u3

Substituting the given vectors and coefficients:

(1, 2, 3) = x(2, 0, 3) + y(-3, 0, 2) + z(0, 7, 0)

Simplifying the equation component-wise:

1 = 2x - 3y

2 = 7y

3 = 3x + 2y

From the second equation, we can solve for y:

y = 2/7

Substituting y into the first equation:

1 = 2x - 3(2/7)

1 = 2x - 6/7

7 = 14x - 6

14x = 13

x = 13/14

Substituting the found values of x and y into the third equation

3 = 3(13/14) + 2(2/7)

3 = 39/14 + 4/7

3 = 39/14 + 8/14

3 = 47/14

Therefore, we have determined the values of x, y, and z as follows:

x = 13/14

y = 2/7

z = 47/14

Thus, we can write the vector v = (1, 2, 3) as a linear combination of u1 = (2, 0, 3), u2 = (-3, 0, 2), and u3 = (0, 7, 0) as:

v = (13/14)u1 + (2/7)u2 + (47/14)u3

Therefore, v can be expressed as a linear combination of the given vectors.

Final Answer:Therefore,the linear combination of v = (13/14)u1 + (2/7)u2 + (47/14)u3  

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The linear combination of v = (13/14)u1 + (2/7)u2 + (47/14)u3  

To express a vector as a linear combination of  vectors using a system of equations, we need to find the coefficients that multiply each given vector to obtain the desired vector. This can be done by setting up a system of equations, where each equation corresponds to the components of the vectors involved.

Body of the Solution:

(a) To show that the vectors u1 = (2, 0, 3), u2 = (-3, 0, 2), and u3 = (0, 7, 0) form an orthogonal basis for R^3, we need to demonstrate two conditions: orthogonality and linear independence.

Orthogonality: We need to show that each pair of vectors is orthogonal, meaning their dot product is zero.

u1 · u2 = (2)(-3) + (0)(0) + (3)(2) = -6 + 0 + 6 = 0

u1 · u3 = (2)(0) + (0)(7) + (3)(0) = 0 + 0 + 0 = 0

u2 · u3 = (-3)(0) + (0)(7) + (2)(0) = 0 + 0 + 0 = 0

Since the dot product of every pair of vectors is zero, they are orthogonal.

  2.Linear Independence: We need to show that the vectors u1, u2, and u3 are linearly independent, meaning that no vector can be written as a linear combination of the other vectors.

We can determine linear independence by forming a matrix with the vectors as its columns and performing row operations to check if the matrix can be reduced to the identity matrix.

[A | I] = [u1 | u2 | u3 | I] =

[2 -3 0 | 1 0 0]

[0 0 7 | 0 1 0]

[3 2 0 | 0 0 1]

Performing row operations:

R3 - (3/2)R1 -> R3

R1 <-> R2

[1 0 0 | -3/2 1 0]

[0 1 0 | 0 1 0]

[0 0 7 | 0 0 1]

Since we can obtain the identity matrix on the left side, the vectors u1, u2, and u3 are linearly independent.

Therefore, the vectors u1 = (2, 0, 3), u2 = (-3, 0, 2), and u3 = (0, 7, 0) form an orthogonal basis for R^3.

(b) To write v = (1, 2, 3) as a linear combination of u1, u2, and u3, we need to find the coefficients x, y, and z such that:

v = xu1 + yu2 + z*u3

Substituting the given vectors and coefficients:

(1, 2, 3) = x(2, 0, 3) + y(-3, 0, 2) + z(0, 7, 0)

Simplifying the equation component-wise:

1 = 2x - 3y

2 = 7y

3 = 3x + 2y

From the second equation, we can solve for y:

y = 2/7

Substituting y into the first equation:

1 = 2x - 3(2/7)

1 = 2x - 6/7

7 = 14x - 6

14x = 13

x = 13/14

Substituting the found values of x and y into the third equation

3 = 3(13/14) + 2(2/7)

3 = 39/14 + 4/7

3 = 39/14 + 8/14

3 = 47/14

Therefore, we have determined the values of x, y, and z as follows:

x = 13/14

y = 2/7

z = 47/14

Thus, we can write the vector v = (1, 2, 3) as a linear combination of u1 = (2, 0, 3), u2 = (-3, 0, 2), and u3 = (0, 7, 0) as:

v = (13/14)u1 + (2/7)u2 + (47/14)u3

Therefore, v can be expressed as a linear combination of the given vectors.

Therefore, the linear combination of v = (13/14)u1 + (2/7)u2 + (47/14)u3  

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The value of the sample proportionThe sample proportion is the percentage of individuals in a sample who have the attribute of interest. As a result, the sample proportion is computed by dividing the number of students who answered "yes" by the total number of students surveyed.

Here's the computation:Sample proportion= 220/400= 0.55Therefore, the sample proportion is 0.55.b. The standard error of the sample proportionThe standard error of the sample proportion can be determined using the following formula:Standard error of Standard error of the sample proportion= √[(0.55 * 0.45)/400]= √(0.00061875)= 0.0249Therefore, the standard error of the sample proportion is 0.0249.c. Constructing an approximate 95% confidence interval for the true proportion

A confidence interval is a range of values around a sample statistic, such as the sample proportion, that is expected to contain the true value of the population parameter with a certain degree of confidence. A 95 percent confidence interval implies that we are 95 percent certain that the true population parameter is within the specified interval.Let's first compute the margin of error:Margin of error= z* √[(p*q)/n]wherez= critical value of the standard normal distribution for a 95% confidence level= 1.96Margin of error= 1.96* √[(0.55*0.45)/400]= 0.0487Therefore, the margin of error is 0.0487. Now that we have the margin of error, we can construct the confidence interval using the following formula:Confidence interval= sample proportion ± margin of error= 0.55 ± 0.0487= (0.5013, 0.5987)Therefore, an approximate 95 percent confidence interval for the true proportion is (0.5013, 0.5987).

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As he cooks on the barbecue, the weight of the tank goes down because some of the propane is getting used up.

Given that is happening, the graph showing that has to start with a lot in it and slowly decrease.

That being said, the graph representing the decrease in propane as time passes is C.

Answer: C.

The result of the expression as a mixed fraction is -1 5/12

Given the expression

\(1\frac{1}{2}+\frac{3}{4}\div (-\frac{1}{3} ) -\frac{2}{3}\)

Write as an improper fraction

\(\frac{3}{2}+\frac{3}{4}\div (-\frac{1}{3} ) -\frac{2}{3}\)

Using the PEDMAS rule;

\(=\frac{3}{2}+(\frac{3}{4}\div (-\frac{1}{3} )) -\frac{2}{3}\\=\frac{3}{2}+(\frac{3}{4}\times -3) -\frac{2}{3}\\=\frac{3}{2}-(\frac{9}{4}) -\frac{2}{3}\\\)

Find the LCM of the result

\(=\frac{18-27-8}{12}\\= \frac{-17}{12}\\= -1\frac{5}{12}\)

Hence the result of the expression as a mixed fraction is -1 5/12

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The work being done while exerting a force of 223 lb against an 8-inch thick brick wall is 1,784 in-lb.

Work is defined as the product of force and displacement in the direction of the force. In this case, the force is 223 lb, and the displacement is the thickness of the brick wall, which is 8 inches.

Work = Force × Displacement

Displacement = 8 inches / 12 inches/foot = 2/3 feet

Substituting the values into the formula, we get:

Work = 223 lb × (2/3) feet

To convert the work to in-lb, we need to multiply by 12 since there are 12 inches in a foot:

Work = 223 lb × (2/3) feet × 12 inches/foot

Work = 223 lb × 8 inches

Work = 1,784 in-lb

The work being done while exerting a force of 223 lb against an 8-inch thick brick wall is 1,784 in-lb.

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Developers determine the specifics of how to build a system in the design phase. b

The design phase and its importance:
Define Objectives:

The design phase begins after the completion of the analysis phase, where developers have gathered and evaluated requirements.

The main objective of the design phase is to create a blueprint for the system that addresses all identified requirements.
Create Architectural Design:

During this step, developers establish the overall structure of the system, including its components, their relationships, and the interactions between them.

This architectural design provides a high-level view of the system's organization.
Design System Components:

With the architectural design in place, developers focus on designing individual components or modules of the system. They create detailed specifications, which include the functionality, inputs, outputs, and processes for each component.
Design User Interface:

The user interface design involves creating a user-friendly and efficient way for end-users to interact with the system. This can include designing screen layouts, menus, buttons, and other interface elements.
Validate Design:

The final step in the design phase is to ensure that the proposed design meets all the requirements identified during the analysis phase.

Developers may use various methods, such as reviews and simulations, to validate their design before proceeding to the implementation phase.
The design phase is a crucial part of the system development process, as it defines how the system will be built, ensuring it meets the needs of its users and the project's objectives.

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The domain of f is the set of all real numbers f(x,y) as (x,y) varies throughout the domain D with three variables.

What is a function?

A unique kind of relation called a function is one in which each input has precisely one output. In other words, the function produces exactly one value for each input value. The graphic above shows a relation rather than a function because one is mapped to two different values. The relation above would turn into a function, though, if one were instead mapped to a single value. Additionally, output values can be equal to input values.

The functions of a point (or vector) in R2 or R3 that have real values will now be looked at. These functions will typically be defined on sets of points in R2, but there will be occasions when we utilise points in R3 and when it is more convenient to think of the points as vectors (or terminal points of vectors).

Each point f(x,y) in D is given a real number f(x,y) according to a real-valued function f defined on a subset D of R2. The domain of f is the set of all real numbers f(x,y) as (x,y) varies throughout the domain D, and the range of f is the greatest set D in R2 on which f is defined.

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To factorise the quadratic expression x² + 6x + 7, we need to find two binomials whose product equals the original expression.

One way to do this is to use the fact that (a + b)² = a² + 2ab + b², which can be rearranged to give:

a² + 2ab + b² = (a + b)²

Using this identity, we can rewrite the expression x² + 6x + 7 as:

x² + 6x + 7 = x² + 2(3)(x) + 3² - 3² + 7

Notice that we added and subtracted 3² = 9 inside the parentheses. Now we can use the identity above to write:

x² + 6x + 7 = (x + 3)² - 2² + 7

Simplifying the expression inside the parentheses gives:

x² + 6x + 7 = (x + 3)² - 4

Therefore, we have factored the quadratic expression x² + 6x + 7 as:

x² + 6x + 7 = (x + 3)² - 4

Given that:

1. The brown family paid $170 for 3 children and 2 adults

2. The Rodriguez family paid $360 for 4 children and 6 adults

a. if x is the price of a child's ticket and y is the price of an adult's ticket, then the system of equations that models the situation would be:

Note that:

Equation (1) and (2) are the model equations for the Brown family and Rodriguez family respectively

b.

Note that, the red and blue line represents the first and second model equations respectively

c. The coordinates of the point intersection is:

d.

The coordinate of the point of intersection (30, 40) means that the price of a child's ticket for the Brown and Rodriguez family is $30, and the cost of an adult's ticket for the Brown and Rodriguez family is $40

Answer:

True

I HOPE IT WILL HELP YOU.

Thank you.

^ - ^

Answer:

ummm

Step-by-step explanation:

look it up

I'm helping you look it up right now

il comment when I find ... ok?

The identification of an unknown compound based on its IR spectrum is not possible with certainty, as there is no unique IR signature for each compound class.

Infrared (IR) spectroscopy is a powerful tool used in the identification of organic compounds. The IR spectrum is unique for each compound and is used to identify the functional groups present in the compound. However, IR spectra alone cannot be used to definitively identify an unknown compound, as different compounds can have similar spectra. To identify an unknown compound, additional information such as melting point, boiling point, and elemental analysis may be needed. Therefore, it is not possible to determine the type of amine (primary, secondary, or tertiary) based solely on its IR spectrum.

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The area of the square increasing with  56 cm²/s

Area or A = x²

where x represents one side of the square

The rate at which each side is increasing or dx/dt = 4 cm/s.

The area of the square is 49cm²

A = x²

x = √A

x = √49 = 7

Each side of the square or x = 7cm

We are trying to find the rate the area is changing, so dA/dt

A=x²

Take the derivative of the area equation with respect to time

dA/dt= 2x * dx/dt

Now plug in the values given to solve for dA/dt: x = 7 cm and dx/dt= 4 cm/s

2 (7) * (4) = 56 cm²/s

Therefore, the area of the square increasing with  56 cm²/s

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Answer:

3 2/11

Step-by-step explanation:

4 3/8 = 4 + 3/8 = 32/8 + 3/8 = 35/8

1 3/8 = 1 + 3/8 = 8/8 + 3/8 = 11/8

then:

4 3/8 ÷ 1 3/8 = (35/8) / (11/8) = 35/11

35/11 = 33/11 + 2/11 = 3 2/11

Answer:

\(4 \frac{3}{8} \div 1 \frac{3}{8} = \frac{35}{8} \div \frac{11}{8} = \frac{35}{8} \times \frac{8}{11} = \boxed{\frac{35}{11} }\)

The value of y will be 104 using direct proportion property between x and y.

What is direct proportion ?

Direct proportion is the relation between two quantities where ratio of these two is equal to a constant.

It is represented by proportional symbol , "∝"

Let's consider constant is m.

For given que,

As y and x are in direct proportion,

y ∝ x

or x ∝ y

eliminating the proportionality,

y = x*m where m is any constant.

y/x = m

Given when y = 64 , then x = 8

So, m = 64/8

          = 8

And when x = 13 then y = ?

y/13 = 8

y = 13*8

  = 104

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Answer:

b,d and g aswell

Step-by-step explanation:

Answer:

hi there is my android tablet still available for sale and only 50 buks

Answer:

Ok so

Step-by-step explanation:

Yes yes yes yes its C

The number of hours if there are that many hours would be 8 classes

The first thing to do is to convert to improper fractions :

6 2 / 3 = 6 + 2 / 3 = 18 / 3 + 2 / 3 = 20/3 hours

Then, the total number of classes taken, given the time for each class and the number of hours in the day, is:

= Total hours / Length of each class

=  ( 20/3 ) / ( 5/6 )

= ( 20 /3 ) × ( 6 / 5 )

= ( 20 × 6 ) / ( 3 × 5 )

= 120 / 15

= 8 classes

In conclusion, there are 8 classes in a 6 2 / 3 hour day.

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Answer:

x= 4/5

y= 2/5

Step-by-step explanation:

3x-y=2

2x+y=5

solve them so that they are in y=mx+b form

3x-y-3x=2-3x

-y= -3x+2

y= 3x -2

2x+y -2x= 2-2x

y= -2x+2

now use the substitution method to get your points

3x -2= -2x+2

3x -2+2= -2x+2+2

3x= -2x+4

3x+2x= -2x+4+2x

5x=4

x= 4/5

now substitute x into any of the 2 equations

y= 3x -2

y= 3(4/5) -2

y= 2 2/5 -2

y= 2/5

Hope this helped!

Answer:

25m/s

Step-by-step explanation:

distance = 30km = 30× 1000m

time = 20 min = 20 × 60 = 1200sec

we know,

speed = distance/time taken

= 30000/1200

= 25m/s