Solve using substitution method. 9x -y +7=0 13x - 4y +5 = 0.​

The measure of angle x and z are 45.7° and 74° respectively.

Given that, straight line l and h are parallel.

Here, in the given figure,

(3x-31)°+z°=180° (Adjacent angles)

z°=180°-(3x-31)°

From the given figure,

z°=74° (Corresponding angles are equal)

180°-(3x-31)°=74°

180°-74°=(3x-31)°

(3x-31)°=106°

3x=106+31

3x=137

x=137/3

x=45.7°

Therefore, the measure of angle x and z are 45.7° and 74° respectively.

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The probability that individual ii-2 exhibits the disease given a 75% penetrance is 0.75 or 75%.

Penetrance refers to the probability of an individual expressing a particular trait or disease given their genetic makeup. In this case, the penetrance of the disease is 75%, which means that there is a 75% chance that an individual with the genetic mutation for the disease will actually exhibit the disease. Therefore, the probability that individual ii-2 exhibits the disease given this penetrance is also 0.75 or 75%.

1. Penetrance is the probability that an individual with a specific genotype will express the associated phenotype or disease.
2. In this case, the penetrance of the disease is 75%, which means there is a 75% chance that an individual with the disease-associated genotype will exhibit the disease.
3. Given this penetrance, the probability that individual ii-2 exhibits the disease is 0.75 or 75%.

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The center and vertices if the ellipse is,

Center = (0, 0)

Vertex = (±7, 0)

We have to given that;

Equation of Ellipse is,

⇒ x²/49 + y² / 4 = 1

Since, We know that;

For equation of ellipse,

x²/a² + y²/b² = 1

Center = (0, 0)

Vertex = (±a, 0); for a > 0

Here, Equation of Ellipse is,

⇒ x²/49 + y² / 4 = 1

Here, a² = 49

a = ± 7

And, b² = 4

b = ±2

Hence, a > b

So, We get;

Center = (0, 0)

Vertex = (±a, 0); for a > 0

Vertex = (±7, 0)

Thus, The center and vertices if the ellipse is,

Center = (0, 0)

Vertex = (±7, 0)

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Answer:

3

Step-by-step explanation:

the answer is 3, the working is in the image

There are no points where the graph of f(x) = x² intersects the line y = x - 2, and the equation has no real solutions.

To solve x² - 2 = 2x using the graph of the function f(x) = x² we can start by rewriting the equation as x^2 - 2x - 2 = 0.

Then, we can graph the function f(x) = x² and find the points where the graph intersects the line y = x - 2.

These points correspond to the solutions of the equation x² - 2x - 2 = 0.

We can then use the quadratic formula to solve for x:

x = (-(-1) ± √((-1)² - 4(1)(2))) / (2(1))

x = (1 ± √(-7)) / 2

Since the discriminant is negative, there are no real solutions to the equation x² - 2 = 2x.

Therefore, there are no points where the graph of f(x) = x² intersects the line y = x - 2, and the equation has no real solutions.

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To find the limit of lim xy/√x^2 + y^2 (x,y) → (0,0), we can use polar coordinates. the limit is: lim xy/√(x^2 + y^2) as (x,y) → (0,0) = 0

Let x = rcosθ and y = rsinθ. Then, the limit becomes lim (rcosθ)(rsinθ)/√(rcosθ)^2 + (rsinθ)^2 as r approaches 0. Simplifying, we get lim rcosθsinθ/√r^2(cos^2θ + sin^2θ) as r approaches 0. Canceling out the r, we get lim cosθsinθ/√(cos^2θ + sin^2θ) as r approaches 0. Since cosθsinθ is less than or equal to 1, the limit must exist and equal 0.

Therefore, the limit of lim xy/√x^2 + y^2 (x,y) → (0,0) is 0.

To find the limit of lim xy/√(x^2 + y^2) as (x,y) → (0,0), you can use polar coordinates to transform the expression. Let x = rcosθ and y = rsinθ. Then, the given expression becomes:

(r*cosθ * r*sinθ) / √(r^2*cos^2θ + r^2*sin^2θ) = r^2*sinθ*cosθ / (r*√(cos^2θ + sin^2θ))

Simplifying the expression, we get:

r*sinθ*cosθ

Now, as (x,y) → (0,0), r → 0. The limit we are looking for is:

lim r*sinθ*cosθ as r → 0

Since sinθ and cosθ are bounded between -1 and 1, the product r*sinθ*cosθ will also approach 0 as r approaches 0.

Therefore, the limit is:

lim xy/√(x^2 + y^2) as (x,y) → (0,0) = 0

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The mathematical expressions or equations about the image  44%, 0.44 and 11/25

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

The fundraiser image (see attachment)

From the image, we have the following readings

Total amount to be raised = $250,000

Amount already raised = $110,000

When represented as a percentage, we have

percentage = 110,000/250,000 * 100%

Evaluate

percentage = 44%

As a fraction, we have

percentage = 44/100 = 11/25

As a decimal, we have

percentage = 0.44

Hence, the mathematical expressions about the image are 44%, 0.44 and 11/25

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The equation of the circle, obtained by applying the completing the square method to the specified equation indicates that the center and radius of the circle are;

Center (0, 6) and radius 7.5

The general form of the equation of a circle is; (x - h)² + (y - k)² = r², where;

(h, k) = The coordinates of the center of the circle

r = The measure of the length of the radius

The possible equation obtained from a similar question on the internet can be presented as follows;

x² + y² - 12·y - 20.25 = 0

The above equation can be evaluated using the completing the square method and excluding the x² term as follows;

y² - 12·y - 20.25 = 0

y² - 12·y = 20.25

y² - 12·y + (-12/2)² = 20.25 + (-12/2)²

y² - 12·y + (-6)² = 20.25 + (-6)² = 56.25

(y - 6)² = 56.25

Therefore;

y - 6 = √(56.25) = ±7.5

The possible equation of the circle obtained by plugging in the x² term therefore is; (x - 0)² + (y - 6)² = 7.5²

The center of the circle is therefore;

(h, k) = (0, 6)

The radius of the circle, r = 7.5

The possible correction is therefore, option (a), where the 5 is a typing error

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Answer:

  264 cm²

Step-by-step explanation:

You want the area of a polygon composed of a 12 cm square with triangles of height 5 cm attached to each side.

The area of the square is the square of its side lenght:

  A = s²

  A = (12 cm)² = 144 cm²

The area of the four triangles is ...

  A = 4 × (1/2bh)

  A = 4 × 1/2(12 cm)(5 cm) = 120 cm²

The total area of the composite figure is ...

  A = square area + triangle area

  A = 144 cm² +120 cm² = 264 cm²

The area of the polygon is 264 cm².

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The value of x in the parallel line is 11.

When parallel lines are cut with a transversal line, angle relationship are formed such as corresponding angles, alternate interior angles, alternate exterior angles, corresponding angles, vertically opposite angles etc.

Therefore, let's use the angle relationship to find the value of x .

Hence,

6x + 14 = 80(corresponding angles and vertically opposite angles)

6x + 14 = 80

subtract 14 from both sides of the equation

6x + 14 - 14 = 80 - 14

6x = 66

divide both sides of the equation by 6

x = 66 / 6

x = 11

Therefore,

x = 11

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Answer:

[tex]4 {a}^{3} - {a}^{2} b - 36a + 9b[/tex]

[tex] = {a}^{2} (4a - b) - 9(4a - b)[/tex]

[tex] = ( {a}^{2} - 9)(4a - b)[/tex]

[tex] = (a + 3)(a - 3)(4a - b)[/tex]

The percentage decrease in flight time between Air New Zealand's first flight from Auckland to Sydney, which took nine hours, and the current flight time of about three hours can be calculated. The percentage decrease represents the reduction in flight time as a proportion of the original flight time.

   To calculate the percentage decrease, we first need to find the difference in flight time between the first flight and the current flight. The difference is obtained by subtracting the current flight time from the original flight time: 9 hours - 3 hours = 6 hours.

Next, we calculate the percentage decrease by dividing the difference in flight time by the original flight time and multiplying by 100:

Percentage decrease = (6 hours / 9 hours) * 100 = 66.67%

Therefore, there has been a 66.67% decrease in flight time between Air New Zealand's first flight from Auckland to Sydney and the current flight time. This represents a significant reduction in the time it takes to complete the journey.

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Answer:

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

Original price is $48 and it is now 70% off, then the sale price is:

Therefore, the sale price of the book is $14.40.

[tex]\textit{arc's length}\\\\ s = r\theta ~~ \begin{cases} r=radius\\ \theta =\stackrel{radians}{angle}\\[-0.5em] \hrulefill\\ \theta =2\\ s=6 \end{cases}\implies 6=r2\implies \cfrac{6}{2}=r\implies 3=r \\\\[-0.35em] ~\dotfill\\\\ \textit{area of a sector of a circle}\\\\ A=\cfrac{\theta r^2}{2} ~~ \begin{cases} r=radius\\ \theta =\stackrel{radians}{angle}\\[-0.5em] \hrulefill\\ r=3\\ \theta =2 \end{cases}\implies A=\cfrac{(2)(3)^2}{2}\implies A=9~in^2[/tex]

Answer:  How many hours did Jacob work in his second week if he earned $117?​

Step-by-step explanation:

We can start by setting up a proportion to relate the number of hours worked to the amount earned:

hours worked / amount earned = constant of proportionality

Let's call the constant of proportionality "k". Then we have:

15 / 146.26 = k

Solving for k, we get:

k = 9.75

Now we can use this value of k to find the number of hours Jacob worked in his second week:

117 / 9.75 = 12

Therefore, Jacob worked 12 hours in his second week if he earned $117.

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6y² - 13y + 6 is the product of 2y -3 and 3y - 2.

Given the following linear expression

(2y-3)(3y-2)

We need to expand the expression to get a quadratic function as shown below:

(2y-3)(3y-2) = 2y(3y) - 2(2y) - 3(3y) -3(-2)

(2y-3)(3y-2) = 6y² - 4y - 9y + 6

(2y-3)(3y-2) = 6y² - 13y + 6

Hence the product of 2y - 3 and 3y - 2 is equivalent to 6y² - 13y + 6

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The statement that defines the function's range is option a) all real numbers greater than or equal to -1.

The given function is a quadratic function, which is a parabola that opens upwards. The graph of the function has its vertex at the point (3,-1), which is the minimum point of the parabola.

The range of the function is the set of all possible output values or y-values that the function can produce.

Since the parabola opens upwards and the minimum point is at y=-1/4, the range of the function f(x)=(x-4)(x-2) is all real numbers greater than or equal to -1.

Therefore, we can say that the range is all real numbers greater than or equal to -1.

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Correct Question

The function f(x) = (x − 4)(x − 2) is shown.What is the range of the function? a) all real numbers less than or equal to 3

b) all real numbers less than or equal to −1

c) all real numbers greater than or equal to 3

d) all real numbers greater than or equal to −1

1. We can use the expression in option D

2. ║YC║ IS 3

3. ║BX║is 1.2

Similar triangles have several important properties. One of the key properties is that their corresponding angles are congruent, which means they have the same measures.

When triangles are similar, their corresponding sides are proportional. This means that if you take the ratio of the lengths of any two corresponding sides.

We know that;

║BC║ / ║YC║ = ║AB║ /  ║AX║

15/  ║YC║ = 10/2

║YC║ = 15 * 2/10

= 3

Also;

║BC║ /  ║YC║ =  ║AB║ /  ║BX║

10/2 = 6 / ║BX║

║BX║ = 2 * 6/10

= 1.2

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The answer is 1,184 Revolutions (option C).

First, we need to convert the diameter of the wheel to meters.

18 inches = 18/39.3701 meters ≈ 0.4572 meters

The circumference of the wheel is:

π × diameter = 3.14 × 0.4572 ≈ 1.436 meters

To travel 1,700 meters, the wheel needs to make:

1700/1.436 ≈ 1184 revolutions

Therefore, the answer is 1,184 revolutions (option C).

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The product QS is impossible because of the dimensions

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

Matrices Q, R and S with the dimensions

Q = 2 by 2

R = 2 by 2

S = 2 by 3

The product QS is the product of matrices 2 by 2 and 2 by 3

This is not possible because the dimensions of the matrices Q and R do not match i.e. it is not possible to multiply matrices 2 by 2 and 2 by 3

Here, we have

S = 2 by 3

R = 2 by 2

This is also not possible because of the reason above

So, it has no order

Here, we have

[tex]Q = \left[\begin{array}{cc}2&-1\\4&3\end{array}\right][/tex]

[tex]R = \left[\begin{array}{cc}1&6\\-5&4\end{array}\right][/tex]

So, we have

[tex]QR = \left[\begin{array}{cc}2 * 1 + -1 * 5&2 * 6 - 1 * 4\\4 * 1 + 3 *-5&4 * 6 + 3 * 4\end{array}\right][/tex]

Evaluate

[tex]QR = \left[\begin{array}{cc}-3&8\\-11&36\end{array}\right][/tex]

Hence, the product QR is [tex]QR = \left[\begin{array}{cc}-3&8\\-11&36\end{array}\right][/tex]

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Answer:

Mean: 20

Median: 16

Mode: No mode

Step-by-step explanation:

For the mean:

44 + 4 + 27 + 5 = 80

80/4 = 20

For the median:

5 + 27 = 32

32/2 = 16

For the mode:
None of the numbers are repeated.

Answer:

We can use trigonometry to solve this problem. Let's call the total distance traveled on the ski lift "d". We know that the angle of elevation from the bottom of the ski lift to the top of the mountain is 62°, which means the angle of depression from the top of the mountain to the bottom of the ski lift is also 62°.

Using trigonometry, we can write:

sin(62°) = 1,760 / d

To solve for "d", we can isolate it by multiplying both sides by "d" and then dividing both sides by sin(62°):

d = 1,760 / sin(62°)

Using a calculator, we get:

d ≈ 1,966.6 feet

Therefore, the total distance traveled on the ski lift from the bottom to the top of the mountain is approximately 1,966.6 feet.

Answer:

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

The probability of flipping a coin and having it land "heads" up is 1/2.

Since each coin flip is independent, the probability of getting three heads in a row is the product of the individual probabilities.

Therefore, the probability of flipping a coin three times and having them all land "heads" up is:

Main Answer: A range of values, that with a certain degree of probability contain the population parameter, is known as a "confidence interval estimate."

Supporting Question and Answer:

What is the purpose of a confidence interval estimate in statistics?

The purpose of a confidence interval estimate in statistics is to provide a range of values that, with a certain degree of probability, contains the population parameter of interest. This range allows for a measure of uncertainty and provides a level of confidence in the estimation process.

Body of the Solution: The correct answer is "confidence interval estimate."

A confidence interval estimate is a range of values that, with a certain degree of probability (often represented by a confidence level), is believed to contain the population parameter of interest. It is used in statistics to provide an estimate of an unknown population parameter based on sample data. The confidence interval provides a range rather than a single point estimate, allowing for a measure of uncertainty in the estimation process.

Final Answer: The correct answer is "confidence interval estimate."

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A range of values, that with a certain degree of probability contain the population parameter, is known as a "confidence interval estimate."

The purpose of a confidence interval estimate in statistics is to provide a range of values that, with a certain degree of probability, contains the population parameter of interest. This range allows for a measure of uncertainty and provides a level of confidence in the estimation process.

The correct answer is "confidence interval estimate."

A confidence interval estimate is a range of values that, with a certain degree of probability (often represented by a confidence level), is believed to contain the population parameter of interest. It is used in statistics to provide an estimate of an unknown population parameter based on sample data. The confidence interval provides a range rather than a single point estimate, allowing for a measure of uncertainty in the estimation process.

The correct answer is "confidence interval estimate."

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Answer:

The formula for calculating the area of a regular polygon is A = (n/2) * L * R, where n is the number of sides in the polygon, L is the length of one side of the polygon, and R is the radius of an inscribed circle.

Step-by-step explanation:

The formula for calculating the area of a regular polygon is A = (n/2) * L * R, where n is the number of sides in the polygon, L is the length of one side of the polygon, and R is the radius of an inscribed circle.

The  sculpture's dimensions or the size of the mosaic tiles, it's not possible to determine the exact number of tiles needed to cover the sculpture.

The number of tiles required depends on factors such as the size of the sculpture, the desired level of detail, and the size of the individual mosaic tiles.

To calculate the minimum number of tiles needed, we would need to know the surface area of the sculpture and the surface area covered by each tile.

The surface area of the sculpture could be approximated by breaking it down into smaller geometric shapes and summing up their individual areas. Then, by dividing the sculpture's surface area by the area covered by each tile, we could estimate the minimum number of tiles required.

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The height of the pyramid is equal to 17 units.

In Mathematics and Geometry, the volume of a rectangular pyramid can be calculated by using the following formula:

Volume of a rectangular pyramid = 1/3 × L × W × H

Where:

By substituting the given dimensions (parameters) into the formula for the volume of a rectangular pyramid, we have the following;

765 = 1/3 × 9 × 15 ×  H

Height, H = 765/45

Height, H = 17 units.

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Answer:

5 Big Airplanes

Step-by-step explanation:

16 airplanes IN TOTAL

11 airplanes ARE SMALL

so we simply subtract 11 from 16 to find how many airplanes are left besides the small ones.

The meteorologist needs to analyze approximately 164 air samples to be 80% certain that the error of estimate does not exceed 0.2 ppm.

A meteorologist aiming to estimate the nitrogen dioxide content in the air needs to consider the standard deviation and desired level of certainty. In this case, the known standard deviation is 2 ppm, and the desired certainty is 80%, with an error of estimate not exceeding 0.2 ppm.
To calculate the number of air samples needed, the meteorologist can use the formula:
n = (Z * σ / E)^2
Here, n represents the required sample size, Z is the z-score corresponding to the desired certainty level (80%), σ is the standard deviation (2 ppm), and E is the margin of error (0.2 ppm).
For 80% certainty, the z-score is approximately 1.28. Plugging the values into the formula, we get:
n = (1.28 * 2 / 0.2)^2 = (12.8)^2 ≈ 164
Thus, the meteorologist needs to analyze approximately 164 air samples to be 80% certain that the error of estimate does not exceed 0.2 ppm.

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The step in showing that[tex]n^3+2n[/tex] is divisible by 3 by mathematical induction is: Prove that the statement is true when n = k. Option B

This step involves substituting k for n in the expression [tex]n^3+2n[/tex] and showing that the result is divisible by 3. In other words, we need to show that:

[tex]k^3 + 2k[/tex] is divisible by 3.

If we assume that the statement is true for n = k, then we can substitute k+1 for n in the expression [tex]n^3+2n[/tex] and simplify:

=[tex](k+1)^3 + 2(k+1) = k^3 + 3k^2 + 3k + 1 + 2k + 2[/tex]

= [tex]k^3 + 3k^2 + 5k + 3[/tex]

= [tex](k^3 + 2k) + (3k^2 + 3k)[/tex]

Since we assumed that the statement is true for n = k, we know that [tex]k^3 + 2k[/tex] is divisible by 3. Also, [tex]3k^2 + 3k[/tex] is divisible by 3 because it has a factor of 3. Therefore, the entire expression [tex](k+1)^3 + 2(k+1)[/tex]is also divisible by 3.

This completes the inductive step, and we can now conclude by mathematical induction that the statement [tex]n^3+2n[/tex] is divisible by 3 is true for all positive integers n.

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