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The answers that describe the quadrilateral DEFG area rectangle and parallelogram.

The correct answer choice is option A and B.

A quadrilateral is a parallelogram, which has opposite sides that are congruent and parallel.

Quadrilateral DEFG

if line DE || FG,

line EF // GD,

DF = EG and

diagonals DF and EG are perpendicular,

then, the quadrilateral is a parallelogram

Hence, the quadrilateral DEFG is a rectangle and parallelogram.

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Answer:

Step-by-step explanation:

Answer:

y=1; x=2

Step-by-step explanation:

Substitution:

x=2y

2x+5y=9

=> if x=2y, plug in the x value into other equation, so

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

2(2y)+5y=9

4y+5y=9

9y=9

y=1

You have the Y value, so now solve for X

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

plug in y value to x=2y

so x=2(1)

x=2

Solving single variable equations involves isolating the unknown variable on one side of the equals sign.

When solving a single variable equation, the goal is to isolate the variable on one side of the equation. This is typically done by performing inverse operations to eliminate any constants or coefficients attached to the variable.

The steps involve simplifying both sides of the equation, combining like terms, and applying inverse operations such as addition, subtraction, multiplication, or division to move the variable to one side. The process continues until the variable is isolated, and the solution is obtained.

It's important to perform the same operation on both sides of the equation to maintain equality. By following these steps, the unknown variable can be determined, solving the single variable equation.

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Although the sample size is sufficiently big to adopt a normal approximation, the population is increases. He can calculate the confidence interval as a result. Option d is appropriate.

Based on the information given, we can assume that the sample size is large enough (n=50) to use a normal distribution approximation to calculate the confidence interval. The fact that the population is right skewed is not a problem because we are using a normal distribution approximation.

The manager can use the following formula to calculate the confidence interval for the population mean:

CI = X ± z* (σ/√n)

Here X = sample mean = 100,000 hours

z* = z-score for the desired confidence level (e.g., 1.96 for a 95% confidence level)

σ = population standard deviation = 3,000 hours

n = sample size = 50

Since the confidence level is not specified in the problem, let's assume a 95% confidence level. Thus, the z-score for a 95% confidence level is 1.96. Substituting the values into the formula, we get:

CI = 100,000 ± 1.96 * (3,000/√50)

Simplifying the expression, we get:

CI = 100,000 ± 837.83

Therefore, the confidence interval for the average length of life of the electronic components is (99162.17, 100837.83) hours.

The manager can be confident that the true population mean lies within this interval with a 95% confidence level.

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This assumption does not affect the calculation of the confidence interval for the sample mean. Option d. The population is right-skewed, but the sample size is large enough to use a normal approximation. Thus, he can compute the confidence interval.

The manager has a sample size of 50, which is considered a large sample size. Therefore, he can use a normal distribution to compute the confidence interval. Additionally, the sample standard deviation is known, and the sample mean is normally distributed due to the Central Limit Theorem. Hence, he can calculate the confidence interval using the formula:

Confidence interval = sample mean ± (z-score) x (standard error)

where the standard error = standard deviation / square root of sample size.

Since the population is assumed to be right-skewed, it is not appropriate to assume a normal distribution for the individual data points. However, this assumption does not affect the calculation of the confidence interval for the sample mean.

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Answer:

-6, -2

Step-by-step explanation:

-2 ×3 = -6

-6 ×3 = -18

-18 x3 = -54

-54 x3 = -162

All of these fractions are equivalent to a number greater than 26, none of them is not equivalent to 26

To determine which fraction is not equivalent to 26, convert each fraction to a decimal or mixed number and compare it to 26.

131/3 = 43.666

123612/36 = 3433

4124/12 = 343.666

696/9 = 77.333

Since all of these fractions are equivalent to a number greater than or equal to 26, none of them is not equivalent to 26. Therefore, the answer is "none of the above".

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The value of a is 2/√7.

The given quadratic equation is x² ₋ 3ax ₊ a² = 0

sum of the roots of the equation  = 4

here, A = 1

B = 3a

C = a²

Let α and β be the roots of the equation.

α ₊ β = ₋B/A

= ₋3a/1

= ₋3a

⇒ α×β = C/A

= a²/1

= a²

⇒α² ₊ β² = (α ₊ β )²  ₋ 2αβ

= (₋3a)² ₋ 2(a²)

= 9a² ₋ 2a²

therefore, 7a² = 4

a² = 4/7

a = √4/7

a = 2/√7

Hence we found the value of a as 2/√7.

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The most appropriate method for creating an estimate of the percent of district residents who support the building of a new middle school would be  v. A one-sample z-interval for a population proportion.

In this case, the superintendent wants to estimate the proportion (percentage) of district residents who support the building of a new middle school. To achieve this, a random sample of district residents can be selected, and the proportion of residents in the sample who support the new middle school can be calculated.

Since the sample size is relatively large (as it is a large school district), the sampling distribution can be assumed to follow a normal distribution. Therefore, a one-sample z-interval for a population proportion is suitable for estimating the proportion of district residents who support the new middle school.

Using this method, a confidence interval can be constructed around the sample proportion, providing an estimate of the true proportion of district residents who support the new middle school, along with a measure of uncertainty.

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The value of x that satisfies the equation is x = 15/8, which is equivalent to 1.875.

To solve the equation (2/3)x - (1/5)x = x - 1 and find the value of x, we can follow these steps:

Combine like terms on the left side of the equation:

(2/3 - 1/5)x = x - 1

Find a common denominator for the fractions on the left side. The common denominator for 3 and 5 is 15, so we rewrite the equation as:

(10/15 - 3/15)x = x - 1

Simplify the left side of the equation:

(7/15)x = x - 1

To eliminate the fraction, we can multiply both sides of the equation by the denominator of the fraction, which is 15:

15 * (7/15)x = 15 * (x - 1)

This simplifies to:

7x = 15x - 15

Subtract 15x from both sides of the equation to isolate the x term:

7x - 15x = -15

Simplifying further:

-8x = -15

Divide both sides of the equation by -8 to solve for x:

x = (-15) / (-8)

Simplifying the division:

x = 15/8

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Answer:

Just use your number line for help but you have to figure out if the numbers are positive or negative.

Step-by-step explanation:

If Ann lives at 0 and ben lives 7 blocks from Ann then you would say ben lives a number 7 on the number line and Carol lives 2 blocks from ben then carol would live at 9.

Answer:

-9, -5,5,9

Just use a number line, it's easy.

a)

I) The ratio is given as follows: 1/2.

II) The scale factor is given as follows: 2.

b)

I) The ratio is given as follows: 1/5.

II) The scale factor is given as follows: 5.

A dilation is defined as a non-rigid transformation that multiplies the distances between every point in a polygon or even a function graph, called the center of dilation, by a constant factor called the scale factor.

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The generating function for the sequence {an} is given by a(x) = (1 + 2x) / (1 - x - 6x^2). It captures the terms of the sequence {an} as coefficients of the powers of x.

To find the generating function of the sequence {an}, we can use the properties of generating functions and solve the given recurrence relation.

The given recurrence relation is: an = an-1 + 6an-2

We are also given the initial conditions: a0 = 1 and a1 = 3.

To find the generating function, we define the generating function A(x) as:

a(x) = a0 + a1x + a2x² + a3x³ + ...

Multiplying the recurrence relation by x^n and summing over all values of n, we get:

∑(an × xⁿ) = ∑(an-1 × xⁿ) + 6∑(an-2 × xⁿ)

Now, let's express each summation in terms of the generating function a(x):

a(x) - a0 - a1x = x(A(x) - a0) + 6x²ᵃ⁽ˣ⁾

Simplifying and rearranging the terms, we have:

a(x)(1 - x - 6x²) = a0 + (a1 - a0)x

Using the given initial conditions, we have:

a(x)(1 - x - 6x²) = 1 + 2x

Now, we can solve for A(x) by dividing both sides by (1 - x - 6x^2²):

a(x) = (1 + 2x) / (1 - x - 6x²)

Therefore, the generating function for the given sequence is a(x) = (1 + 2x) / (1 - x - 6x²).

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Answer: yes

Step-by-step explanation:

Answer:

1,50965

Step-by-step explanation:

Answer:

Mag, real num, complex num, vector

Step-by-step explanation:

Absolute values measures magnitude of a real number, complex number, or vector. All numbers in the absolute value become positive :)

Plz mark brainliest

Answer:

absolute value measure of the magnitude of a real number complex number or vector

a)The value of c can be found by using the fact that the sum of all probabilities in a probability mass function (PMF) must equal 1. Therefore, we have:

ΣP(x) = cM + c(M + 1) + c(M + 2) + ... = 1

This is an infinite geometric series with the first term a = cM and common ratio r = 1, so we can use the formula for the sum of an infinite geometric series:

Sum = a / (1 - r) = cM / (1 - 1) = cM / 0

Since we cannot divide by zero, the only way to satisfy this equation is for cM = 0, which means c = 0.

b) P(X = 0) can be found by simply plugging x = 0 into the probability mass function P(x) = cM:

P(X = 0) = c(0) = 0

c) P(X > 2) can be found by summing the probabilities of all possible values greater than 2:

P(X > 2) = P(X = 3) + P(X = 4) + P(X = 5) + ...

Using the PMF P(x) = cM, we have:

P(X > 2) = c(3) + c(4) + c(5) + ... = 0 (since c = 0)

So, the answers to your question are: c = 0, P(X = 0) = 0, and P(X > 2) = 0.

First, let me clarify that a probability mass function is a function that maps each possible value of a random variable to the probability of that value occurring. In this case, we have a discrete random variable X that can take on the values 0, 1, 2, and so on.

Now, let's tackle the questions one by one:

a) To find the value of c, we need to use the fact that the probabilities for all possible values of X must add up to 1. In other words, we need to find the sum of P(X = x) over all possible values of x, and set it equal to 1:

P(X=0) + P(X=1) + P(X=2) + ... = 1

Using the formula given, we can write this as:

CM + CM + C(M+1) + C(M+2) + ... = 1

Simplifying the sum using the formula for the sum of an arithmetic series, we get:

CM(1 + 1 + 2 + 3 + ...) = 1

Note that the sum 1 + 1 + 2 + 3 + ... is equal to the sum of the first M natural numbers, which is M(M+1)/2. Substituting this, we get:

CM(M(M+1)/2) = 1

Solving for c, we get:

c = 2/(M(M+1))

b) To find P(X=0), we simply plug in x=0 into the formula given:

P(X=0) = CM = c(0) = 0

c) To find P(X > 2), we need to sum up the probabilities for all values of X that are greater than 2:

P(X > 2) = P(X=3) + P(X=4) + ...

Using the formula given, we can write this as:

P(X > 2) = C(M+3) + C(M+4) + ...

Simplifying the sum using the formula for the sum of an arithmetic series, we get:

P(X > 2) = C(3+4+...) = C(1+2+3+...) = CM(M+1)/2

Substituting the value of c we found in part a), we get:
P(X > 2) = 1/2

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Answer:

x = 6

Step-by-step explanation:

Using the rule of exponents

\(a^{m}\) × \(a^{n}\) ⇔ \(a^{(m+n)}\) , then

\(3^{-2}\) × \(3^{x}\) = 81 , that is

\(3^{x-2}\) = \(3^{4}\)

Since the bases on both sides are equal, both 3 then equate the exponents

x - 2 = 4 ( add 2 to both sides )

x = 6

After 22 thousand cell phones have been sold, sales are increasing by 3 thousand phones per month. 0.180y (1-y/90) is the differential equation describing cell phone sales.

The Logistic model is given by,

dy/dt = ry (1-y/m)

where r is the rate constant.

M is the maximum capacity.

plugin M,

dy/dt = ry (1-y/90)

Now we need to find rate constant r,

put y = 22, y' = 3

3 = 22r (1- 22/90)

3 = 22r (1- 90-22/90)

3 = 22r (68/90)

3 = 11r (68/45)

748r = 135

r = 135/78

r = 0.180481283422.

rounding off to 3 decimals,

r = 0.180

Now the final differential equation becomes,

dy/dt = 0.180y (1-y/90).

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TT is equal to T-1, so the given matrix is an orthogonal matrix.

What is an orthogonal matrix?

Here, the determinant of T,

 |T| = cos²∅ + sin²∅

      = 1

Now, its cofactors,

\(T_{11}\) = cos ∅

\(T_{12\) = sin ∅

       \(T_{21\)= -sin ∅

\(T_{22\) = cos ∅

Now, the adjoint matrix of cofactors matrix transpose \(T^T\) is equal to \(T^{-1.\)

Hence, the given matrix is an orthogonal matrix.

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Answer:

no bc the two figures need to be exactly the same size

Step-by-step explanation:

Answer:

sinA = h/c; sinC = h/a

Step-by-step explanation:

Which pair of equations below is a result of constructing the altitude, h, in Triangle ABC?

sinA= h/c

sinC= h/a

sinA= h/c

sinB= b/c

sinA= b/c

sinC= b/a

Solution:

A triangle is a polygon with three sides and three angles. There are different types of triangles such as right angled, acute, obtuse and isosceles triangle.

In right angle triangle, one angle is 90°. From Pythagoras theorem, the square of the longest side (hypotenuse) is equal to the sum of the square of the two sides.

In right triangle, trigonometric identities are used to show the relationship between the sides of a triangle and the angles.

sinθ = opposite / hypotenuse, cosθ = adjacent / hypotenuse, tanθ = opposite / adjacent

Therefore in triangle ABC:

sinA = h/c;  sinC = h/a

Answer:

A

Step-by-step explanation:

Answer:

6 units

Step-by-step explanation:

Let's call the length of the rectangle "L" and the width "W".

From the problem, we know that the width is 2 units less than the length, so we can write:

W = L - 2

We also know that the area of the rectangle is 48 square units, so we can write:

A = L * W

Substituting the first equation into the second equation, we get:

48 = L * (L - 2)

Expanding the brackets, we get:

48 = L^2 - 2L

Rearranging, we get:

L^2 - 2L - 48 = 0

Now we can use the quadratic formula to solve for L:

L = (-b ± sqrt(b^2 - 4ac)) / 2a

In this case, a = 1, b = -2, and c = -48. Substituting these values into the formula, we get:

L = (2 ± sqrt(4 + 192)) / 2

L = (2 ± sqrt(196)) / 2

L = (2 ± 14) / 2

So, L = 8 or L = -6. We can ignore the negative solution, so the length of the rectangle is 8 units.

Now we can use the first equation to find the width:

W = L - 2

W = 8 - 2

W = 6

Therefore, the width of the rectangle is 6 units.

The product of\((2.50×10^6)(1.56×10^5)\) is calculated by multiplying the coefficients (2.50 and 1.56) to get 3.9 and adding the exponents (6 and 5) to get 11. The final answer is expressed in scientific notation as \(3.9×10^11\).

To calculate the product of two numbers written in scientific notation, we multiply their coefficients and add their exponents. In this case, we have \((2.50×10^6)(1.56×10^5).\)

First, let's multiply the coefficients: 2.50 × 1.56 = 3.9.

Next, we add the exponents: 6 + 5 = 11.

Combining the result of the coefficient multiplication (3.9) with the sum of the exponents (11), we express the final answer in scientific notation as 3.9×10^11.

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Yes, a and b are independent events .

Given,

p(a) = 0.8

p(b) = 0.5

p(a ∪ b) = 0.9

Now,

According to the formula,

P(A∩ B ) = P(A) + P(B) - P(A∪B)

Substitute the values,

P(A∩B) = 0.8 + 0.5 - 0.9

P(A∩B) = 0.4

Now for events to be independent,

P(A∩B) = P(A) * P (B)

P(A∩B) = 0.8 * 0.4

Hence ,

P(A∩B) = 0.4

Thus the event are independent .

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