"my quadrilateral has no lines of symmetry, but it does have 180° rotation symmetry. what is it"

Answer:

#20 is -20

#21 is -3

#22 is 36

Answer:

x(3+9)=72

or, x(12)=72

or, x=72÷12

or, x = 6 ans.

Answer: x=6

Step-by-step explanation:

Let's solve your equation step-by-step.

x(3+9)=72

Step 1: Simplify both sides of the equation.

12x=72

Step 2: Divide both sides by 12.

12x/12=72/12

x=6

Answer:

x=6

There are 210 ways we can give 4 different prizes to any 4 of 10 people if no person receives more than 1 prize.

To calculate the number of ways we can do this, we can use the formula for combinations. The formula for the number of ways to choose r objects from a set of n objects is:

ⁿCₓ = n! / x!(n-x)!

where n! represents the factorial of n, which is the product of all positive integers up to n.

5! = 5 x 4 x 3 x 2 x 1 = 120.

In this problem, we want to choose 4 people from a set of 10, so we can use the formula:

¹⁰C₄ = 10! / 4!(10-4)!

Simplifying this expression, we get:

¹⁰C₄ = (10 x 9 x 8 x 7) / (4 x 3 x 2 x 1)

¹⁰C₄ = 210

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Step-by-step explanation:

If x-y =3 then y-x =-3

For example: 10-5 =5 / 5 - 10 =-5

Hope this helps..

Good Luck!

The water in the aquarium tank will rise by 0.05 cm when the brick is placed in the bottom of the tank.

The volume of the brick is calculated as 40 cm x 20 cm x 10 cm = 8000 cm^3. Since the brick is submerged in the water, the amount of water displaced by the brick is equal to the volume of the brick. Therefore, the water level will rise by the same amount as the volume of the brick, which is \(8000 cm^3\).

To calculate the rise in water level, we need to divide the volume of the brick by the area of the rectangular base of the tank. The area of the rectangular base is calculated as 100 cm x 400 cm = \(40000 cm^2\). Dividing the volume of the brick (\(8000 cm^3\)) by the area of the rectangular base \(40000 cm^2\) gives us 0.2 cm. However, the brick is not placed at the bottom of the tank, but rather at a height of 40 cm. Therefore, we need to divide the calculated value by the height of the tank, which is 40 cm. This gives us a final result of 0.2 cm / 40 cm = 0.05 cm, which is the rise in water level when the brick is placed in the bottom of the tank.

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when you are interrogating the external validity of a sample, option(b). how was the sample collected? is the most important question to ask.

What is External validity?

The concept of external validity is related to the concept of generalization. It's imperative to keep that in mind. It is important to remember that validity refers to the approximate truth of a proposition, an inference, or a conclusion. In other words, external validity refers to the relative truth of generalizations based on generalizations. The external validity of your study is the degree to which the conclusions are applicable to other people, places, and times.

An external validity threat is an explanation of how a generalization could be flawed. A study you conducted in a particular place, with certain types of people, at a particular time, can be generalized to another context (for instance, another place, with slightly different people, at a slightly different time). External validity can be compromised in three ways: people, places, and times.

Question

When you are interrogating the external validity of a sample, which is the most important question to ask?

a. how many people are in the sample?

b. how was the sample collected?

c. how were the participants measured?

d. how many people are in the population?

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Answer:

5/6, -0.62, -0.615

Step-by-step explanation:

Hope this Help If i got it wrong I'm sorry I tried :(

The reduced fraction is 7 using GCF method.The GCF is also known as the Highest Common Factor (HCF)

The largest number, which is the factor of two or more number is called the Greatest Common Factor (GCF). It is the largest number (factor) that divide them resulting in a Natural number. Once all the factors of the number are found, there are few factors which are common in both. The largest number that is found in the common factors is called the greatest common factor. The GCF is also known as the Highest Common Factor (HCF)

The fraction = 14/66

The factors of 14 = 2×2×2×3

The factors of 28 = 11*3*2

The gcf is 2 × 2 = 4

Divide the denominator and numerator by 4

14 ÷2 = 7

14÷ 2 = 7

We get,

The fraction = 14/2 =7

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Answer:

(6;2)

Step-by-step explanation:

AC=C-A

=(11;-3)-(2-6)

=(9;3)

=2/3(9;3)

=(6;2)

we have shown that the eigenvalue of Am is 0, which implies that λ=0 is the only eigenvalue of A.

To show that λ = 0 is the only eigenvalue of A, we need to use the fact that A is nilpotent, which means there exists some m > 1 such that Am = O, where O is the zero matrix.

Now, suppose A has an eigenvalue λ. Then there exists a non-zero vector x such that Ax = λx. We can apply A to both sides of this equation m times to get:

Amx = λm x

But we know that Am = O, so this simplifies to:

Ox = λm x

Since x is non-zero, we can divide both sides by x to get:

O = λm

So we have found that λm = 0. But since m > 1, this means that λ must be 0.

Now we need to show that 0 is indeed an eigenvalue of A. Since Am = O for some m > 1, we know that A is not invertible and its determinant is 0.

This means that there must be at least one eigenvector with eigenvalue 0.

The only eigenvalue of O is 0, since O takes any vector to zero. Thus the eigenvalue of Am is also 0, which implies that λ = 0 is the only eigenvalue of A.

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Answer:

  C.  142°

Step-by-step explanation:

You want the angle between vectors u=3i+√3j and v=-2i-5j.

There are a number of ways the angle between the vectors can be found. For example, the dot-product relation can give you the cosine of the angle:

  u•v = |u|·|v|·cos(θ) . . . . . . where θ is the angle of interest

You can find the angles of the vectors individually, and subtract those:

  u = |u|∠α

  v = |v|∠β

  θ = α - β

When the vectors are expressed as complex numbers, the angle between them is the angle of their quotient:

  \(\dfrac{\vec{u}}{\vec{v}}=\dfrac{|\vec{u}|\angle\alpha}{|\vec{v}|\angle\beta}=\dfrac{|\vec{u}|}{|\vec{v}|}\angle(\alpha-\beta)=\dfrac{|\vec{u}|}{|\vec{v}|}\angle\theta\)

This method is used in the calculation shown in the first attachment. The angle between u and v is about 142°.

A graphing program can draw the vectors and measure the angle between them. This is shown in the second attachment.

__

Additional comment

The approach using the quotient of the vectors written as complex numbers is simply computed using a calculator with appropriate complex number functions. There doesn't seem to be any 3D equivalent.

The dot-product relation will work with 3D vectors as well as 2D vectors.

<95141404393>

The planet's a) size has virtually no effect on its structure.

The size of a planet does not affect its internal structure significantly because the same physical laws govern the formation and evolution of all planets. However, the size of a planet does have some impact on its atmosphere, gravity, and surface features.

For example, smaller planets may have weaker gravity, which makes it easier for gases to escape their atmosphere. Conversely, larger planets may have stronger gravity, which can compress their atmosphere and create more extreme weather patterns.

Overall, a planet's structure is primarily determined by its mass, composition, and magnetic field, rather than its size.

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Given:

The pentagons ABCDE and JKLMN are similar.

To find:

The length x of MN.

Explanation:

Since the given pentagons are similair.

So, the corresponding sides are proportional.

Therefore, we write

Thus, the value of x is 4.2.

Final answer:

The length x of MN is 4.2.

To reparametrize the curve with respect to arc length, we need to find the arc length function s(t) and then solve for t in terms of s.

The arc length function is given by:

s(t) = ∫√[r'(t)·r'(t)] dt

where r'(t) is the derivative of r(t) with respect to t.

We can calculate r'(t) as:

r'(t) = (2e^(2t)cos(2t) - 4e^(2t)sin(2t))i + (12e^(2t)sin(2t))j + (2e^(2t)sin(2t) + 6e^(2t)cos(2t))k

Now we can substitute this into the arc length formula and integrate:

s(t) = ∫√[(2e^(2t)cos(2t) - 4e^(2t)sin(2t))^2 + (12e^(2t)sin(2t))^2 + (2e^(2t)sin(2t) + 6e^(2t)cos(2t))^2] dt

This integral looks quite complicated, so we will use a numerical integration method to approximate s(t).

We can use the trapezoidal rule to numerically integrate s(t) between t = 0 and some value t = T:

s(T) ≈ ∑[s(iΔt) + s((i+1)Δt)]/2 * Δt

where Δt = T/n is the step size, and n is the number of intervals we use.

Once we have approximated s(t), we can solve for t in terms of s using numerical methods such as the bisection method or Newton's method.

For example, if we want to find the value of t that corresponds to s = 10, we can solve:

s(t) = 10

for t using numerical methods. Once we have t, we can plug it back into r(t) to get the reparametrized curve in terms of arc length s.

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Answer:

c=3

Step-by-step explanation:

Answer:

----------------------------------

Given:

Perimeter is:

or

The perimeter is at most 96 cm (not greater than):

The matching choice is A.

Answer:

1/5

Step-by-step explanation:

The length of AB in the given similar-triangles AEC and BDC using basic proportionality theorem is 3 units.

What are similar triangle?

The polygons which are same in shape but differ in size are similar figures or polygons. The triangles which have all angles equal & sides are proportional are similar triangles. According to basic proportionality theorem,the other two sides of a triangle are divided equally by a line that is drawn parallel to one of the sides and cuts the other two.

Here, consider the ΔAEC & ΔBDC,

Given: ED=2 units

           CD= 6units

            BC=9units

            AB=?

Given that BD║AE, which means the ratio of sides are proportional

CD : ED = CB : AB

6     : 2   =   9  : AB

       \(\frac{6}{2}\)     = 9 : AB

           AB=9 x \(\frac{2}{6}\)

           AB= 3 units.

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Answer:

standard or standards

Step-by-step explanation:

Answer:

Triangular pyramid and Rectangular prism

Step-by-step explanation:

There are several different uses of the formula V = BH. For example, we used the formula V = BH for a cylinder, a rectangular prism, and a triangular pyramid. But be careful! All of the elements in the formulas don't mean the same! I really hope this helps you a bit!

Volume of the Right triangular prism and rectangular prism can be found by using the formula V= B×h

Volume is a scalar quantity expressing the amount of three-dimensional space enclosed by a closed surface

It refers to the area of one of the bases of a solid figure.

Given,

Volume V= B×h

Where B is the Base area and h is the height

Volume of the Right triangular prism and rectangular prism can be found by using the given formula V = B×h. Because two identical shapes (base) facing each other with a height h

But we cannot find the volume of the Rectangular pyramid, triangular pyramid and mid by using the given equation because this formula is used to find the volume of a geometric prism or cylinder.

Hence, Volume of the Right triangular prism and rectangular prism can be found by using the formula V= B×h

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Answer:5 weeks

Step-by-step explanation:

if you multipy how much they make by each answer choice then you add the amount they have already saved you will see the only answer choice that results in the same number is 5

Answer:

3x+12

Step-by-step explanation:

When we multipy 3 with (x+4) it becomes 3x+12

Answer:

3x+12

Step-by-step explanation:

3(x+4)

3*x=3.....keep the x with 3 because x just represents 1

3*4=12

so your answer should be

3x+12

hope this helps :)

Answer:

(-12/5 , -41/5) , (3 , 8)

Step-by-step explanation:

Solve for the first variable in one of the equations, then substitute the result into the other equation.

To determine Km from a double-reciprocal plot, you would choose option (A) which is to multiply the reciprocal of the x-axis intercept by -1.

In the double-reciprocal plot equation, the x-axis intercept is -1/Km, and the y-axis intercept is 1/Vmax. Therefore, if you take the reciprocal of the x-axis intercept, you get -Km, and multiplying it by -1 gives you Km.

This method is preferred because it is more accurate than estimating Km based on the position of the curve on the plot or by taking the x-axis intercept where V0 = 1/2 Vmax, which can be influenced by experimental error.

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Answer:

Sample Response: To write a two-variable equation, I would first need to know how much Maya’s allowance was. Then, I would need the cost of playing the arcade game and of riding the Ferris wheel. I could let the equation be cost of playing the arcade games plus cost of riding the Ferris wheel equals the total allowance. My variables would represent the number of times Maya played the arcade game and the number of times she rode the Ferris wheel. With this equation I could solve for how many times she rode the Ferris wheel given the number of times she played the arcade game.

Answers are cost of Arcade game per play and cost of each ferry ride and we can solve.

An assignment of values to the unknown variables that establishes the equality in the equation is referred to as a solution. To put it another way, a solution is a value or set of values (one for each unknown) that, when used to replace the unknowns, cause the equation to equal itself.

Maya used some of her allowance to ride the ferris wheel and play a few rounds of an arcade game.

We could develop a two-variable equation if we knew the total allotment, the cost of each arcade game played, and the cost of each ferry ride.

We can solve the equations to determine how many times Maya visited the Ferris wheel and how many times she played arcade games.

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62.5% or 62.5 out of every 100 students exceeded the minimum standards.

The teacher found that 62 1/2% of the students exceeded the minimum standards. To find the part of the students who exceeded the standards, we need to convert the percentage to a decimal.
To do this, divide 62.5 by 100: 62.5 ÷ 100 = 0.625.
This means that 0.625 represents the decimal form of 62 1/2%.
To find the part of the students who exceeded the standards, multiply 0.625 by the total number of students.
For example, if there are 100 students in total, multiply 0.625 by 100: 0.625 x 100 = 62.5.
Therefore, 62.5 represents the part of the students who exceeded the minimum standards.

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Let  p be the function that gives the cost , in dollars, of producing 1 watt of solar energy years after 1977. Here is a table showing the values of  from 1977 to 1987.

t         p(t)                       p(10)-p(0)

0 80                          p(10)

1 60                          p(10)- p(0)/10-0

2 45                            p(10-0)

3 33.75

4 25.31

5 18.98

6 14.24

7 10.68

8 8.01

9 6.01

10 4.51

Which phrase best captures the average rate of change in the price of solar energy between 1977 and 1987?

Which phrase best captures the average rate of change in the price of solar energy between 1977 and 1987?

Which equation best captures the yearly average increase rate of solar prices between 1977 and 1987?

This discussion aims to help students remember what average rate of change for a function means and how it is computed. Select students to explain what each expression's value in this context means. For instance, the cost difference for a solar cell between 1977 and 1987 is represented by the formula p(10)- p(0), whereas the percent change between 1977 and 1987 may be calculated as p(10)/p(0). The fact that the real phrase for the average rate of change, p(10)-p(0)/10-0=-7.55, reveals that the price declined by -$7.55 on average per year since the expression considers the whole difference in price between the 1977 and 1987 divided by the total number of years that passed.

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9514 1404 393

Answer:

  3.  m∠A < 80°

Step-by-step explanation:

The exterior angle NGS, marked as 80°, has a measure that is the sum of the measures of the remote interior angles: GAN, GNA.

If we assume that angle measures cannot be zero, then we must have ...

  m∠A +m∠N = 80°

  m∠A = 80° -m∠N

Since m∠N > 0, the measure of angle A must be less than 80°.

This conclusion matches choice 3.

Answer:

155625 is the answer.

Step-by-step explanation:

add astre#6666 on discord for the step by step

Answer:

The answer is 36

How to get there:

11*11=121

10*10=100

9*9=81

8*8=64

7*7=49

6*6=36

Ans 36

The pattern is basically multiplying by the same factor. As the number decreases, the factors decrease by one. So we go from 7*7 which equals 49, to 6*6 which equals 36. Just notice the patterns :)