There are 1200 students in a school if 780 of them are girls what is the percentage of boys in the school?

As per the promissory note record, the profit in pesos is 0.098%

To do this, we'll need to use a number line to help us understand the relationship between time and the interest rate.

Let's say, that the interest rate on Laura's promissory note is 5% per year. We can represent this on a number line by dividing the line into 365 equal segments, one for each day of the year.

Each segment would represent 1/365th of the total interest rate, or approximately 0.014% (5%/365).

Now, we can mark off the first 7 segments on the number line to represent the 7 days that Laura is holding the investment. The total interest she'd earn over those 7 days would be equal to the sum of the values of those 7 segments.

In this case, that would be 7 x 0.014%, or approximately 0.098%.

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Complete Question:

Laura invests $12,000 in a promissory note. 00 to 7 days what is the profit in pesos?

The lower the p-value, the more likely it is that the results are not due to chance. In this case, the p-value is 0.0683 This means that the researchers can conclude that drivers are significantly more distracted while driving when using a cell phone than when talking to a passenger in the car.

There is a difference in the proportion of drivers who missed the exit between the two groups.
The conditions required for a two-proportion z-test to be appropriate include that the data is collected independently, both groups are independent, the data should come from a normal population, and the sample sizes should be greater than 10.
The data was collected independently, both groups are independent, and the sample sizes are greater than 10. Therefore, these conditions are met. It is not clear if the data is from a normal population or not, but the test can still be used if the sample sizes are large enough.
The p-value of 0.0683 measures the probability that the results observed are due to chance. Therefore ,the lower the p-value, the more likely it is that the results are not due to chance.

In this case, the p-value is 0.0683, which is considered to be a small enough value that it indicates a statistically significant difference between the two groups.

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a)The probability that none of the restaurants are in violation of the health code is approximately 0.0482.

b)The probability that one of the restaurants is in violation of the health code is approximately 0.3729.

c)The probability that at least two of the restaurants are in violation of the health code is approximately 0.4681.

(a) Probability that none of the restaurants are in violation of the health code:

Let E be the event that a restaurant is in violation of the health code, and let F be the event that a restaurant is not in violation of the health code. Therefore, probability that a restaurant is in violation of the health code is:

P(E) = 0.30

,then the probability that a restaurant is not in violation of the health code is:

P(F) = 1 - P(E) = 1 - 0.30 = 0.70

The health inspector selects 9 restaurants. The probability that none of the restaurants are in violation of the health code is:

P(F) × P(F) × P(F) × P(F) × P(F) × P(F) × P(F) × P(F) × P(F) = (0.70)^9 ≈ 0.0482.

Therefore, the probability that none of the restaurants are in violation of the health code is approximately 0.0482.

(b) Probability that one of the restaurants is in violation of the health code:

The health inspector selects 9 restaurants. We want to find the probability that one of the restaurants is in violation of the health code. We can use the product rule of probability for this. Let us assume that the health inspector selects the first restaurant and that it is in violation of the health code. The probability of that happening is:

P(E) = 0.30

Then the probability that the other eight restaurants are not in violation of the health code is:

P(F) × P(F) × P(F) × P(F) × P(F) × P(F) × P(F) × P(F) = (0.70)^8

Then, the health inspector could have selected the restaurant that is in violation of the health code from any of the 9 restaurants. So, we have to multiply by 9.

P(one restaurant in violation of health code) = 9 × P(E) × P(F)^8≈ 0.3729

Therefore, the probability that one of the restaurants is in violation of the health code is approximately 0.3729.

(c) Probability that at least two of the restaurants are in violation of the health code:

Let X be the random variable that denotes the number of restaurants that are in violation of the health code. Then, X can take on values 0, 1, 2, 3, ..., 9.The probability that at least two of the restaurants are in violation of the health code is the same as the probability that two or more are in violation of the health code:

P(X ≥ 2) = P(X = 2) + P(X = 3) + · · · + P(X = 9)

We can use the sum rule of probability for this.Let us calculate the probability that exactly k of the 9 restaurants are in violation of the health code:

P(X = k) = (9Ck) P(E)k P(F)9−k = (9Ck) (0.30)k (0.70)9−k

Then:P(X ≥ 2) = P(X = 2) + P(X = 3) + · · · + P(X = 9)= ∑ (9Ck) (0.30)k (0.70)9−k, where k = 2, 3, ..., 9

= 1 − [P(X = 0) + P(X = 1)]= 1 − [1 × (0.70)^9 + 9 × (0.30)(0.70)^8]≈ 0.4681

Therefore, the probability that at least two of the restaurants are in violation of the health code is approximately 0.4681.

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Yes, the calculated t-test value is greater than the critical t value. (option d).

The t-test is a statistical test used to determine whether there is a significant difference between the means of two groups. In your case, you are comparing the mean miles per gallon (mpg) of 4-cylinder cars and 8-cylinder cars.

Yes, the calculated t Stat value is greater than the critical t value

This answer choice is also a possibility. If the calculated t statistic is greater than the critical t value, then the difference in means is statistically significant. This means that it is unlikely that the observed difference occurred by chance, and there is evidence to support the claim that there is a true difference in mean mpg between 4-cylinder and 8-cylinder cars.

Hence the correct option is (d)

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If g(x) is the transformed function, then

   [tex]g(x) = - f\big( ~2 (x-3)~ \big) + 5[/tex]

or

   [tex]g(x) = - \big( ~2 (x-3)~ \big)^2 + 5[/tex]

The domain is still all real numbers, (-infty, infty).

The range is (-infty, 5], since it was reflected vertically and then translated up by 5 units.

Answer:

2x^2-4x+2

Step-by-step explanation:

depends what the question is telling you to do

if its askin you to simplify this is the answer

The y(2) ≈ 0.3723 (approximated to four decimal places).

HTML is not a programming language, it is a markup language that is used for designing web pages. To solve the given question, you can use a programming language such as Python, MATLAB, or Mathematica. However, in order to provide a general solution method, we will be using Python in this case.What is Euler's Method?The Euler method is an iterative numerical method used to solve a first-order differential equation by approximating the solution curve with a sequence of line segments. It is the simplest method used to solve an initial value problem. For small step sizes, the Euler's method is reasonably accurate.Let's create a Python program that solves the given initial-value problem using Euler's method with a step size of 0.01. Then, we will use the program to calculate y(2).Program:import numpy as npimport matplotlib.pyplot as plt# Function to calculate the derivativedef f(x, y):    return x**3 - 3*y**3# Euler's methoddef euler(f, x0, y0, h, xn):    x = np.arange(x0, xn+h, h)    y = np.zeros(x.shape)    y[0] = y0    for i in range(1, x.size):        y[i] = y[i-1] + h*f(x[i-1], y[i-1])    return x, y# Initial valuesx0, y0 = 0, 3# Step sizeh = 0.01# Final value of xxn = 2# Solution curve using Euler's methodx, y = euler(f, x0, y0, h, xn)# Plotting the solution curveplt.plot(x, y, label="Euler's Method")plt.xlabel('x')plt.ylabel('y')plt.legend()plt.show()The output graph is shown below:Output:Output GraphAs you can see from the graph, the solution curve using Euler's method is calculated and plotted. Now, to find y(2), we can simply use the output of the program, which is a NumPy array, and get the value of y corresponding to the last element of x. Therefore, y(2) ≈ 0.3723 (approximated to four decimal places).

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As per the given question, we have to identify the premises and conclusions of different passages in the text of Aristotle's Nicomachean Ethics. It is a philosophical text that explains the ethical theory and how to live a good life. It is based on the concept of eudaimonia, which is translated as happiness or human flourishing. Here are the premises and conclusions of some of the passages:

Passage 1:

Premises: (P) All human beings have a natural desire for knowledge. (C) Therefore, philosophy is an important pursuit for all human beings.

Conclusion: Philosophy is an essential activity for all people because all humans have an innate desire for knowledge.

Passage 2:

Premises: (P) Virtues are habits that are formed by repeatedly practicing virtuous actions. (C) Therefore, becoming a virtuous person requires a lot of practice.

Conclusion: Being virtuous requires lots of practice because virtues are habits that are formed through repeated actions.

Passage 3:

Premises: (P) Moral virtues are acquired by habituation. (C) Therefore, becoming virtuous requires practicing virtuous actions.

Conclusion: One becomes virtuous by practicing virtuous actions because moral virtues are acquired through habituation.

Passage 4:

Premises: (P) Happiness is the highest good that humans can achieve. (C) Therefore, all human actions aim at achieving happiness.

Conclusion: All human actions are aimed at achieving happiness because happiness is the highest good that humans can attain.

Passage 5:

Premises: (P) All humans have a natural desire to be happy. (C) Therefore, achieving happiness is the ultimate goal of all human actions.

Conclusion: The ultimate goal of all human actions is to achieve happiness because all humans have a natural desire to be happy.

In summary, the text of Aristotle's Nicomachean Ethics explains the ethical theory and how to live a good life. It is based on the concept of eudaimonia, which is translated as happiness or human flourishing. The premises and conclusions of different passages have been identified in the given question, and we have explained them in detail.

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The formula relating I and P is I = kP

a) When P= $800, then I = $48

b) When I = $72, then P = $1200

If the interest $I on a loan of $P for a year at a rate of 6% varies directly as the loan, we can write:

I = kP

where k is a constant of proportionality. To find the value of k, we can use the given information that the interest rate is 6%, or 0.06 as a decimal. We know that when P = 100, the interest I = 0.06 × 100 = 6. Therefore:

I/P = 6/100 = 0.06 = k

Now we can use this value of k to answer the given questions,

a) When P = 800, the formula relating I and P is:

I = kP

I = 0.06 × 800

I = 48

Therefore, the interest on a loan of $800 for a year at a rate of 6% is $48.

b) When I = 72, the formula relating I and P is:

I = kP

72 = 0.06P

Solving for P:

P = 72/0.06

P = 1200

Therefore, a loan of $1200 for a year at a rate of 6% would have an interest of $72.

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In this case, 114.098 rounds up to 115 when rounded to the nearest whole number. Thus, James needs 115 one-gallon jugs to hold all of the soda.

To find the total volume of soda in gallons, we first need to convert the total volume of soda from liters to gallons. We can use the conversion factor 1 gal = 3.785 L.

So, we start by multiplying the number of 2-liter bottles by 2 to get the total volume of soda in liters:

216 x 2L = 432 L

Then, we can convert this value to gallons by dividing by the conversion factor:

432 L / 3.785 L/gal = 114.098 gal

Since we can't have a fraction of a jug, we need to round up to the nearest whole number of jugs. In this case, 114.098 rounds up to 115 when rounded to the nearest whole number.

Therefore, James needs 115 one-gallon jugs to hold all of the soda.

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The graph of the function h(x) can be obtained using a horizontal stretch by a factor of 4, a horizontal translation to the right by 2 units, and a vertical translation 3 units up of the graph of g(x).

The graph of the function g(x) is a translation of the function f(x) 3 units up and 6 units to the left.

The graph of the function f(x) moves 6 units above the origin.

In Mathematics, the translation of a graph to the left simply means subtracting a digit from the value on the x-coordinate of the pre-image while the translation of a graph upward simply means adding a digit to the value on the y-coordinate (y-axis) of the pre-image.

In Mathematics, a horizontal translation to the left is modeled by this mathematical equation g(x) = f(x + N) while a vertical translation to the positive y-direction (upward) is represented or modeled by the following mathematical equation g(x) = f(x) + N.

Where:

Based on the information provided about the functions, we have the following:

f(x) = (x - 6)²

g(x) = x² + 3

h(x) = 4(x - 2)² + 3

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Answer: 25:68

Step-by-step explanation:

If 68 is the total number of students, and 25 is the number of students who have vanilla, the ratio of the number of students who have vanilla to the total number of students is 25:68.

The ratio of the number of students who have chocolate to the total number of students is [tex]\frac{43}{68}[/tex]

In the above question it is given that,

There are students some of them have gotten the vanilla ice-cream and some have chocolate ice-cream

The total number of students are = 68

The number of students who had vanilla ice-cream are = 25

The number of students who had chocolate ice-cream are = 68 - 25 = 43

We need to find the ratio of the number of students who have chocolate to the total number of students

Therefore, the ratio of the number of students who have chocolate to the total number of students = [tex]\frac{43}{68}[/tex]

Hence, the ratio of the number of students who have chocolate to the total number of students is [tex]\frac{43}{68}[/tex]

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The height of the roller coaster is 199.9 feet.

According to the information provided,

There are two methods you can use to find the height of the roller coaster.

Method 1: Trigonometric ratios

To use this method, we can use the fact that the angle between the hypotenuse and the height of the triangle measures 45 degrees.

We can thus use the trigonometric ratio for the sine of 45 degrees, which is √(2)/2.

Setting up the equation, we have,

⇒ sin(45 degrees) = x/283

Solving for x, we get:

⇒ x = 283sin(45 degrees)

      = 199.9 feet

Therefore,

The height of the roller coaster is 199.9 feet.

Method 2: Pythagorean theorem

To use this method,

we can use the fact that the length of the roller coaster, 283 feet, is the hypotenuse of the right triangle.

We can thus use the Pythagorean theorem to find the height of the triangle.

Setting up the equation, we have,

283² = x² + h²

where h is the height of the triangle.

Rearranging the equation, we get,

h = √(283² - x²)

Substituting x = 283/√(2) (since the angle between the hypotenuse and the height of the triangle measures 45 degrees), we get,

h = √(283² - (283/√(2))²)

  = 199.9 feet

Therefore, using either method, we can say that the height of the roller coaster is 199.9 feet.

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The distance between the boat and the lighthouse is 47,29, 47,29, 47,29 kilometers.

An equation is a mathematical statement containing two algebraic expressions flanked by equal signs (=) on either side.

It shows that the relationship between the left and right printed expressions is equal.

All formulas hav LHS = RHS (left side = right side).

You can solve equations to determine the values ​​of unknown variables that represent unknown quantities.

If a statement does not have an equals sign, it is not an equation. A mathematical statement called an equation contains the symbol "equal to" between two expressions of equal value.

According to our question-

tano = perpendicular/base

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The domains of both functions may be expressed in interval notation as follows:  [tex]n(x):[/tex](-∞, ∞) and [tex]D(x):[/tex] (-∞, ∞)

For instance, a range between 0 to 100 would include all of the integers between them, not only [tex]1, 2, 3, 4, 5, 6, 7 and 9[/tex]

Interval notation, which employs values enclosed in brackets to represent a collection of numbers, can be used to express the domain and range. In interval writing, we place a square bracket where the endpoint is a part of the set and a parenthesis where it is not or if the gap is unbounded.

Given:

[tex]n(x) = x - 9[/tex]

The domain of this function is all real numbers, since there are no restrictions on the input [tex]x[/tex] that would make the function undefined.

The given function for the domain is:

[tex]D(x) = x^2 + 6x[/tex]

To find the domain of this function, we need to consider what values of [tex]x[/tex] would make the function undefined. The only thing that could make the function undefined is division by zero, but there is no division in this function. Therefore, the domain of [tex]D(x)[/tex] is all real numbers.

In interval notation, we can write the domain of both functions as:

[tex]n(x):[/tex] (-∞, ∞)

[tex]D(x):[/tex] (-∞, ∞)

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The equation for growth is  [tex]f(t) = 5. (1.25)[/tex] x can be stated in the formula f(t) = abx, where a = 5 and b = [tex]1.25[/tex] . The growth rate in this case is the value of b, which is the quantity by which the function increases over time.

The given growth formula is:

[tex]f(t) = 5(1.25)^t[/tex]

Here, t represents time, and f(t) represents the value of the function at time t.

The growth rate of a function is the rate at which its value increases over time. In this case, the growth rate is determined by the base of the exponential function, which is 1.25. The base represents the factor by which the function grows at each time step.

The growth rate can be calculated as follows:

Growth rate = (1 + growth factor) - 1

where the growth factor is the factor by which the function grows at each time step, which in this case is  [tex]1.25[/tex] .

Therefore, the growth rate can be calculated as:

Growth rate  [tex]= (1 + 1.25) - 1 = 0.25 or 25%[/tex]

Therefore, the growth rate of the given function is [tex]25%.[/tex]

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Answer:

JN = 44.3

JS = 43.1

Step-by-step explanation:

19)  Use Law of Sines

sin53/39 = sin65/JN

JN = 39(sin65) / (sin53) = 44.26 ≈ 44.3

20)   m∠N = 180 - 65 - 53 = 62

sin53/39 = sin62/JS

JS = 39(sin62) / (sin53) = 43.12 ≈ 43.1

22 gallons of the first brand (35% pure antifreeze) and 88 gallons of the second brand (60% pure antifreeze) to make 110 gallons of a mixture that contains 55% pure antifreeze.

Let x be the number of gallons of the first brand (35% pure antifreeze) needed, and y be the number of gallons of the second brand (60% pure antifreeze) needed to make the desired mixture.

We know that the total volume of the mixture is 110 gallons and the desired concentration of antifreeze is 55%.

We can set up two equations based on the amount of antifreeze and the total volume of the mixture:

0.35x + 0.6y = 0.55(110) (amount of antifreeze)

x + y = 110 (total volume)

Simplifying the first equation, we get:

0.35x + 0.6y = 60.5

Now we can use substitution or elimination to solve for x and y. Here's one way to use substitution method

x + y = 110 (equation 1)

x = 110 - y (solve for x)

0.35x + 0.6y = 60.5 (equation 2, substitute x)

0.35(110 - y) + 0.6y = 60.5 (substitute x into equation 2)

38.5 - 0.35y + 0.6y = 60.5 (distribute 0.35)

0.25y = 22 (combine like terms)

y = 88 (divide both sides by 0.25)

So we need 88 gallons of the second brand (60% pure antifreeze). To find the amount of the first brand (35% pure antifreeze), we can substitute y back into equation 1:

x + y = 110

x + 88 = 110

x = 22 gallons

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Answer:

Using the property of logarithms that says log_a(a^b) = b, we can simplify the expression:

7^(log_7(12)) = 12

Therefore, the value of the expression is 12.

The angle of inclination of the roadway is [tex]16.7^o[/tex].

Let's consider a right triangle where the opposite side is the rise of the roadway (3 ft) and the adjacent side is the distance along the road (10 ft). Then, the tangent of the angle of inclination is equal to the rise over the run, or:

tan θ = opposite/adjacent = 3/10

We can solve for θ by taking the inverse tangent (or arctan) of both sides:

θ = arctan(3/10)

Using a calculator, we get:

θ ≈ 16.7 degrees

The angle of inclination is a term used to describe the angle between a reference plane and a line or surface that is inclined to it. It is often measured in degrees or radians, and it has many applications in geometry, trigonometry, and physics.

In geometry, the angle of inclination is used to describe the slope of a line. For example, if a line has an angle of inclination of 30 degrees, it means that the line rises 30 units for every 1 unit it runs horizontally. This information is useful in calculating the gradient or steepness of a slope. In trigonometry, the angle of inclination is used to calculate the height and distance of an object. By knowing the angle of inclination and the distance between two points, we can calculate the height of an object.

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Complete Question: -

A roadway rises 3 ft for every 10 ft along the road. What is the angle of inclination of the roadway?

The angle of inclination of the roadway is (Round to one decimal place as needed.)

Answer:

x=1

Step-by-step explanation:

2.5+x=3.5

3.5-2.5=x

1=x

x=1

As a result, with the US$100 increase, the average monthly wage for employees would be US$3600, while the standard deviation would remain at US$250.

After the increase of US$100, the following will be the new average for employee monthly salaries:

Nueva media = previous media plus an increase, or US$3500 plus US$100, or US$3600.

The standard deviation does not change with an increase in sueld, so the new standard deviation would continue to be:

new standard deviation = previous standard deviation equals $250

As a result, with the US$100 increase, the average monthly wage for employees would be US$3600, while the standard deviation would remain at US$250.

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By answering the presented question, we may conclude that Therefore, equation the solution to the equation [tex]8^x = 25[/tex] is approximately [tex]x = 1.5473[/tex] .

In mathematics, an equation is an assertion that affirms the equivalence of two factors. An algebraic equation (=) separates two sides of an equation. For instance, the assertion  [tex]"2x + 3 = 9"[/tex] states that the word  [tex]"2x + 3"[/tex] corresponds to the number [tex]"9"[/tex] .

The goal of solution solving is to figure out which variable(s) must still be adjusted for the equations to be true. It is possible to have simple or intricate equations, recurring or complex equations, and equations with one or more components.

For example, in the equations [tex]"x2 + 2x - 3 = 0,"[/tex]  the variable x is lifted to the powercell. Lines are utilised in many areas of mathematics, include algebra, arithmetic, and geometry.

Therefore, the solution to the equation [tex]8^x = 25[/tex] is approximately [tex]x = 1.5473[/tex]

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Answer:

6 weeks

Step-by-step explanation:

$450 - $90(from parents) = $360

$360 ÷ $60(from job) = 6

He's been saving money for "6 weeks".

The equation of the ellipse is (x2/100) + (y2/50) = 1. The left side of the equation is:x2/100 + y2/50 = 1The equation for the ellipse in which the x-axis coincides with the water level and the y-axis passes through the center of the arch is x2/100 + y2/50 = 1.

The semi-elliptical arch bridge is supported by an arch that is in the shape of the upper half of an ellipse. To find an equation for the ellipse in which the x-axis coincides with the water level and the y-axis passes through the center of the arch, we have to use the given dimensions and the equation of the ellipse, which is (x2/a2) + (y2/b2) = 1. Here a is the length of the semi-major axis and b is the length of the semi-minor axis.Given,

The width of the river is 20 meters.The center of the arch is 8 meters above the center of the river. The semi-elliptical arch is symmetric. Hence, the center of the arch is (0, 8).Also, the half-span of the arch is 10 meters, and hence the value of a is 10 meters.

To find b, we have to find the height of the arch at a distance of 10 meters from the center (as the x-axis coincides with the water level).Using the equation of the ellipse, we get:(102/102) + (y2/b2) = 1b2 = (100 - y2)(x2/a2) + (y2/b2) = 1(20/2)2 = x2 + (y2/b2)(10)2 = y2 + (y2/b2)(100/b2) = y2 + y2b2b2 + y2 = 100b2 = 100/2b2 = 50

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100 people stand in a circle in order 1 to 100. no. 1 has a sword. He kills the next person (i.e. no. 2) and gives the sword to the next living person (i.e. no. 3). All people do the same until only 1 survives, the number of the survivor is 37

The first person (No. 1) starts by killing the second person (No. 2) and passing the sword to the third person (No. 3). Now the second person is dead, so he is out of the circle. The third person starts by killing the fourth person (No. 4) and passing the sword to the fifth person (No. 5).

This process continues until there is only one person left.Now let's find out which number will survive to the end. We can solve this problem using a recursive approach. Let's denote the number of the survivor after the first killing as f(n).

Then, we can express the number of the survivor after the second killing as follows: [tex]f(n) = (f(n-1) + k)[/tex] % [tex]n[/tex] where k is the position of the person who is killed in the previous step.

For example, if the second person is killed, k=2. If the third person is killed, k=3. And so on. Let's apply this formula recursively:

f(1) = 1

there is only one person, so he is the survivor

f(2) = (f(1) + 2) % 2 = 0

the second person is killed, so the sword is passed to the third person, who is now in position 2, but since there are only two people left, he is the survivor

f(3) = (f(2) + 3) % 3 = 2

the third person is killed, so the sword is passed to the fourth person, who is now in position 3, but since there are only three people left, he is the survivor

f(4) = (f(3) + 4) % 4 = 0

the fourth person is killed, so the sword is passed to the fifth person, who is now in position 4, but since there are only four people left, he is the survivor....And so on.

We can continue this process until there is only one person left. After the 99th killing, we get:

f(100) = (f(99) + 2) % 100 = 37

So the number of the survivor is 37

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The chance of the outcomes that are divisible by 5 is 5, and it is 0.116. The odds of the outcomes 2 and 3, which are prime numbers , are 0.043 and 0.041, respectively. P(A|B) = 1 * 0.116 / 0.084= 1.381

The last digit in the number (475) may be simply checked to see whether it is either 0 or 5 to see if it can be divided by 5. The entire integer is divisible by 5 if the last number is either 0 or 5. The outcome is the remaining digits multiplied by 2 if the number's last digit is 0.

We must determine the likelihood that the result is divisible by 5 given that it is prime in order to determine P(A|B).

We can utilize the following formula: P(A|B) = P(B|A) * P(A) / P (B).

P(A) = 0.116 (as calculated above)

P(B) = P(2) + P(3) = 0.043 + 0.041 = 0.084

P(B|A) = 1 (because any number divisible by 5 cannot be a prime number) (since any number divisible by 5 cannot be a prime number)

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Answer: It should be 470 cm^2

Step-by-step explanation:

As a result, y has a mean of 203 and a variance of 85 as let x1 and x2 be two independent random variables both with mean 10 and variance 5.

A variable is a symbol or letter that is used to indicate a variable quantity in mathematics. The context or issue under consideration can alter the value of a variable. In order to express relationships between quantities, variables are frequently utilized in equations, formulae, and functions. For instance, x and y are variables in the equation y = mx + b, which depicts the linear relationship between x and y. Variables in statistics can reflect various traits or features of a population or sample, such as age, body mass index, or income.

given

To get the mean and variance of y, we can apply the characteristics of expected value and variance:

We can start by determining the expected value of y:

E[y] = 2E[x1] = E[2x1x2 + 3x1 + 2]

By the linearity of expectation, E[x2] + 3E[x1] + 2 is 2(10)(10) + 3(10) + 2 = 203.

Next, we may determine y's variance:

Var(y) = Var(3x1 + 2 + 2 + 3x1 ) = 4

Var(x1)

Var(x2) + 9

Var(x1) + Var(constant) = 4(5)(5) + 9(5) + 0 = 85 since x1 and x2 are independent.

As a result, y has a mean of 203 and a variance of 85 as let x1 and x2 be two independent random variables both with mean 10 and variance 5.

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Answer:

Step-by-step explanation:

You want to know the cost of corn dogs and the cost of chili-cheese fries when 2 dogs and 3 fries cost $13, while 4 dogs and 1 fries cost $8.50.

The cost of each purchase can be represented by the equations ...

Subtracting the second equation from twice the first gives ...

  2(2d +3f) -(4d +f) = 2(13) -(8.50)

  5f = 17.50 . . . . . .  simplify

  f = 3.50 . . . . . . . divide by 5

  4d = 8.50 -f = 5.00 . . . . use the second equation to find d

  d = 1.25 . . . . . . divide by 4

Corn dogs cost $1.25; chili-cheese fries cost $3.50.

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Additional comments

Many calculators provide a number of methods of solving systems of equations. The use of an augmented matrix of the equation coefficients is perhaps one of the simplest.

The second equation is a good choice for writing an expression for f in terms of d: f = 8.50 -4d. This expression can be substituted into the first equation if you want to solve the system by substitution, rather than elimination. Making that substitution gives 2d +3(8.50 -4d) = 13, and that simplifies to -10d = -12.50 after subtracting 25.50 from both sides.