The variety of arrangements we can make for the 2n people to stand in a line such that nobody is next to their spouse;
(2n)! - ∑ⁿₓ₋₁ 2ˣ(-1)ˣ(ⁿCₓ)(2n - x)!
Explain the term exclusion and inclusion?Everything a study needs to meet the inclusion criteria is included. Exclusion criteria are indeed the elements that would exclude a study from inclusion. The following criteria should be taken into account: studies of this kind: It is crucial to choose publications with a study design that is relevant for the research issue.The step for the simplification are-
Utilizing exclusion and inclusion to determine that at least 1 wife is seated next to her husband in the total number of ways to seat 2n individuals in 2n chairs.Let A1 represent the attribute in which at least 1 wife can be seen sitting next to her husband.The wife and husband are then "merged" into one person. We have (nC1) options to select one pair from n couples, leaving us with (2n) to position (2n) "people" in order to obtain (2n)! and so forth.Finally, on a broad note:
(2n)! - (2(ⁿC₁)(2n - 1)! - 2²(ⁿC₂)(2n - 1)! + .....2ˣ(-1)ˣ(ⁿCₓ)(2n - x)!
On further simplifying;
(2n)! - ∑ⁿₓ₋₁ 2ˣ(-1)ˣ(ⁿCₓ)(2n - x)!
Thus, the variety of arrangements we can make for the 2n people to stand in a line such that nobody is next to their spouse;
(2n)! - ∑ⁿₓ₋₁ 2ˣ(-1)ˣ(ⁿCₓ)(2n - x)!
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what is the distance between -5, -3 and -5, -6
To calculate the distance between the points -5, -3 and -5, -6. We apply the following formula:
(x₁, y₁) and (x₂, y₂) d = √(x₂ - x₁)² + (y₂ - y₁)²
The points are:
(x₁ = -5, y₁ = -3) and (x₂= -5, y₂= -6)
We apply the above formula and solve.
d = √(x₂ - x₁)² + (y₂ - y₁)²d = √ (-5 - (-5))² + (-6 - (-3))²d = √ 02 + (-3)² = √ 0 + 9d = √9 = 3The distance between the points -5, -3 and -5, -6 is 3.
Consider a circle whose equation is x2 + y2 – 2x – 8 = 0. Which statements are true? Select three options.
The radius of the circle is 3 units.
The center of the circle lies on the x-axis.
The center of the circle lies on the y-axis. The standard form of the equation is (x – 1)² + y² = 3.
The radius of this circle is the same as the radius of the circle whose equation is x² + y² = 9.
The three (3) statements which are true include the following:
A. The radius of the circle is 3 units.
B. The center of the circle lies on the x-axis.
D. The radius of this circle is the same as the radius of the circle whose equation is x² + y² = 9.
What is the equation of a circle?Mathematically, the standard form of the equation of a circle is represented by this mathematical expression;
(x - h)² + (y - k)² = r² ....equation 1.
Where:
h and k represents the coordinates at the center of a circle.
r represents the radius of a circle.
From the information provided, we have the following equation of a circle:
x² + y² – 2x – 8 = 0 ......equation 2.
In order to determine the true statements, we would rewrite the equation in standard form and then factorize by using completing the square method:
x² – 2x + y² = 8 = 0
x² – 2x + (2/2)² + y² = 8 + (2/2)²
x² – 2x + 1 + y² = 8 + 1
(x – 1)² + (y - 0)² = 9 .......equation 3.
Comparing equation 1 and equation 3, we have the following:
Center (h, k) = (1, 0)
Radius, r = 3
Additionally, this line and the circle's center lies on the x-axis because the y-value is equal to zero (0).
(x – 0)² + (y - 0)² = 3²
x² + y² = 9.
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The area of a rectangle is 2 square feet. The perimeter of the rectangle is 9 ft. Find the length, ll, and width, ww, of the rectangle. What is l^2 + w^2l 2 +w 2 ?.
The rectangle is 4 feet long and 0.5 feet wide. l²+w² equals 16.25 feet².
What is area?The measurement that expresses the size of a region on a plane or curved surface is called area. Surface area refers to the area of an open surface or the boundary of a three-dimensional object, whereas the area of a plane region or plane area refers to the area of a form or planar lamina. Area is a phrase used to describe how much room a 2D form or surface occupies.
Here,
Let l be the length and w be the width.
area=2
lw=2
w=2/l
2(l+w)=9
2l+2w=9
2l+2*2/l=9
2l²+4=9l
2l²-9l+4=0
l=0.5,4
w=4,0.5
l=4 and w=0.5
l²+w²=4²+0.5²
=16.25 feet²
The length of rectangle is 4 feet and width is 0.5 feet. The value of l²+w² is 16.25 feet².
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The sum of two consecutive odd integers is at least 16. Which of the following inequalities would model this statement
The sum of two successive odd integers must be at least 16, hence the inequality will be x+1≥4 and the solution will be x≥3.
What is inequality?In mathematics, "inequality" refers to a relationship between two expressions or values that is not equal to each other. The equation-like form of the formula 5x 4 > 2x + 3 has an arrowhead in place of the equals sign. It is an illustration of inequity. This shows that the left half, 5x 4, is bigger than the right part, 2x + 3. An inequality in mathematics is a relation that compares two numbers or other mathematical expressions in an unequal way. The majority of the time, size comparisons between two numbers on the number line are made.
Here,
Sum of 2 consecutive odd integer=16
Let them be 2x+1 and 2x+3,
2x+1+2x+3≥16
4x+4≥16
x+1≥4
x≥3
The inequality will be x+1≥4 and solution to the inequality will be x≥3 as sum of two consecutive odd integers is at least 16.
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Tom has a total of $220 and he spent $35 on a baseball ticket. What percent of his money did he have left
Answer:
He has $185 left
Step-by-step explanation:
Subtract $220 from how much he spent
calculate the diameter of a circle with an area of 56
Answer:8.44
Step-by-step explanation:
Area of the circle is 56.
Divide 56 by 3.14(Pi)
56/3.14=17.8343949
Square root it
Square root of 17.8343949=4.223078841
4.22 is the radius so to find the diameter you just multiple by 2.
4.223078841x2=8.446157683
Sarah pent 30 minute practicing her pelling word. She pent 3 time a much time reading. How many minute did Sarah pend reading?
Sarah completed reading for x = 18 minutes.
What is unitary method ?Area is the total amount of space that an object's shape or a flat (2-D) surface occupy.
Create a square on paper by using a pencil. Two dimensions make it up. A shape's area on paper is the space it takes up.
Imagine that your square is made up of smaller unit squares.
The area of a figure is equal to the number of unit squares required to completely cover the surface area of a particular 2-D shape. Square cms, square feet, square inches, square meters, etc. are a few common units for measuring area.
To get the area of the square figures presented below, draw unit squares with 1-centimeter sides. Therefore, the shape will be measured.
According to our question
The number of pages Sarah will read in an hour is x. (this is "pages per hour" rate).
(10 minutes) / (3 pages) = (x pages) / (60 minutes)
cross-multiply:
10x = 3*60
x = 18
Hence, Sarah completed reading for x = 18 minutes.
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Geometry: Which chord is nearest the center and why? (ASAP!!!)
Chord AC is the nearest to the center because the perpendicular distance of chord AC from center O is the smallest.
What is a chord of a circle?
A chord of a circle is a straight line segment whose endpoints both lie on a circular arc. The infinite line extension of a chord is a secant line or just secant. More generally, a chord is a line segment joining two points on any curve, for instance, an ellipse.
ΔABC is inscribed in O. If AB = 5, BC = 8, and AC =9.
Now if you look carefully at the given diagram, we can see that the perpendicular distance of chord AC from center O will be smaller than the perpendicular distance of chord AB from center O and the perpendicular distance of chord BC from center O.
Hence, Chord AC is the nearest to the center because the perpendicular distance of chord AC from center O is the smallest.
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Maria scored 20 goals in 4 soccer games
last season. Approximately how many
points did Maria average per game?
Answer:
idek
Step-by-step explanation:
Peter and John are running around the town around the town in opposite directions. Peter can go around the town in 2.5 hours, and John can do the same in 15 hours. Assuming they start at the same time and same place, how many times will they pass each other going in opposite directions in a 24-hour period?
Answer:
90
I am not too sure but this question is VERY BRAIN-INTENSIVE
Sorry, if i am wrong
Find the 3 smallest positive x-intercepts of the graph of
y = cos(12x) + cos(16x) and list them in increasing order.
Submit your answer as a list of x-coordinates from least to greatest.
To find the 3 smallest positive x-intercepts of the graph of y = cos(12x) + cos(16x), you can use the following steps:
Set y equal to 0 and solve for x to find the x-intercepts of the graph.
Since the graph of y = cos(12x) + cos(16x) is periodic with period 2π/12 = π/6 and 2π/16 = π/8, respectively, you only need to consider x-intercepts in the interval [0,π/6).
Use the identity cos(a+b) = cos(a)cos(b) - sin(a)sin(b) to rewrite the equation y = cos(12x) + cos(16x) as:
y = 2cos(4x)cos(8x) - sin(4x)sin(8x)
Set y equal to 0 and solve for x to find the x-intercepts. This will give you the x-coordinates of all the x-intercepts of the graph.
Sort the x-coordinates in increasing order and take the first three smallest positive values to find the 3 smallest positive x-intercepts.
For example, if you set y equal to 0 and solve for x, you get:
0 = 2cos(4x)cos(8x) - sin(4x)sin(8x)
This equation can be rewritten as:
cos(4x)cos(8x) = sin(4x)sin(8x)
Using the identity cos(a) = sin(π/2 - a) and substituting this into the equation above, we get:
sin(4x)sin(8x) = sin(4x + π/2)sin(8x)
This equation simplifies to:
sin(4x)sin(8x) = sin(4x)cos(8x)
Dividing both sides by sin(4x) and rearranging, we get:
sin(8x) = cos(8x)
This equation holds for all values of x that satisfy sin(8x) = cos(8x), so we can find the x-intercepts by setting these two functions equal to each other and solving for x:
sin(8x) = cos(8x)
sin^2(8x) = cos^2(8x)
sin^2(8x) - cos^2(8x) = 0
1 - cos(16x) = 0
cos(16x) = 1
Thus, the x-intercepts of the graph are at x = 0, x = π/16, x = π/8, x = 3π/16, and so on. Since we are only interested in the 3 smallest positive x-intercepts, we can take the first three values in this list: x = 0, x = π/16, and x = π/8.
Therefore, the 3 smallest positive x-intercepts of the graph of y = cos(12x) + cos(16x) are [0, π/16, π/8].
three boxes of supplies have an average (arithmetic mean) weight of 7 kilograms and a median weight of 9 kilograms. what is the maximum possible weig...
In linear equation, 3 t is the maximum possible weight .
What in mathematics is a linear equation?
A linear equation is a first-order (linear) term plus a constant in the algebraic form y=mx+b, where m is the slope and b is the y-intercept.
Sometimes, the aforementioned is referred to as a "linear equation of two variables," where x and y are the variables.
Assuming x to be lightest , y median and z the heaviest.
So according to given information average is 7 so total sum for three box = 21
thus x+y+z = 21
Given y=9 (median weight)
thus x+z = 12
For maximum possible value for x is 3 such that z= 9
if x=4 then Z= 8(this changes median to 8)
So maximum possible value for lightest box is 3
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It takes one machine 25 minutes to pick a bale of cotton, and another machine takes 30 minutes to compete the same job. If both machines are used, how long will it take them to pick a bale of cotton?
Answer:
Hi i'm wondering how to find the answer the answer is 3 over 2 (2k-8) > 1 over 3(k-9)
plssss help me out thank you if you do
Answer: y = -2x + 5
Step-by-step explanation: I think it's the same one...
A company has 30 employees 20 female 10 male, the board of directors decides to ask a group of 10 people, half of which are male, about expanding the company. Determine how many possible groups are there?
Answer:
M=960
F=480
Step-by-step explanation:
look at the work I did
Calculate the distance between the points N=(-5, 7) and P=(-1, 3) in the coordinate plane.
Round your answer to the nearest hundredth.
: 0
Distance:
Answer:
distance ≈ 5.66 units
Step-by-step explanation:
calculate the distance d using the distance formula
d = [tex]\sqrt{(x_{2}-x_{1})^2+(y_{2}-y_{1})^2 }[/tex]
with (x₁, y₁ ) = N (- 5, 7 ) and (x₂, y₂ ) = P (- 1, 3 )
d = [tex]\sqrt{(-1-(-5))^2+(3-7)^2}[/tex]
= [tex]\sqrt{(-1+5)^2+(-4)^2}[/tex]
= [tex]\sqrt{4^2+16}[/tex]
= [tex]\sqrt{16+16}[/tex]
= [tex]\sqrt{32}[/tex]
≈ 5.66 units ( to the nearest hundredth )
Translate this phrase into an algebraic expression.
60 decreased by twice Jenny's score
Use the variable to represent Jenny's score. please help.
The expression for 60 decreased by twice Jenny's score 60 - 2x.
What is an algebraic expression?Expression simply refers to the mathematical statements which have at least two terms which are related by an operator and contain either numbers, variables, or both. Addition, subtraction, multiplication, and division are all possible mathematical operations. As an illustration, the expression x + y has the terms x and y with an addition operator between them.
Let Jenny's score be x.
Twice Jenny's score will be 2x.
Therefore, the expression will be:
= 60 - 2x
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A laptop computer i purchaed for. Each year, it value i $1500 of it value 75% the year before. After how many year will the laptop computer be worth $200 or le
After 7 years the laptop computer will be worth $200 or less.
In this question, we have been given a laptop computer is purchased for $1500 . Each year, its value is 75% of its value the year before.
We need to find the number of years when laptop computer be worth $200 or less.
We can see that given situation represents exponential decay function with initial value 1500, decay rate = 0.75 and the final value = 200
We need to find period t.
For given situation we get an exponential function as,
1500 * (0.75)^t ≤ 200
(0.75)^t ≤ 2/15
t * ln(0.75) ≤ ln(2/15)
t * (-0.2877) ≤ -2.0149
t ≥ (-2.0149)/(-0.2877)
t ≥ 7
Therefore, the laptop computer will be worth $200 or less after 7 years.
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What interest will be earned if $9,000 is invest for 4 years at 12% compounded monthly? Round to 2 decimals.
The required compound interest is $5,510.03
What is compound interest?
Compound interest is the interest imposed on a loan or deposit amount. It is the most commonly used concept in our daily existence. The compound interest for an amount depends on both Principal and interest gained over periods.
Given, Principal = $9,000
Time = 4 years
Interest = 12% = 0.12
For compounded monthly, n = 12
The compound amount for monthly compounded is given by
[tex]A = P(1 + \frac{r}{n} )^{nt}[/tex]
or, A = [tex]9000(1 + \frac{0.12}{12} )^{12*4}[/tex]
or, A = 9000[tex](1+0.01)^{48}[/tex]
A = $14510.03
Compound interest = $14510.03 - $9,000 = $5,510.03
Hence, the required compound interest is $5,510.03
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in older adults, a higher level of social support is related to question 20 options: lower levels of physical activity. a higher probability of being institutionalized. an early cognitive decline. a lower probability of depression.
In older adults, a higher level of social support is related to question is D. a lower probability of depression.
What is depression?Depression is a prevalent mental illness. According to estimates, the disorder affects 5% of adults worldwide. Consistent sadness and a lack of interest in previously fulfilling or enjoyable activities are its defining traits. Additionally, it may impair appetite and sleep. Concentration problems and fatigue are frequent.
A severe mental illness called major depressive disorder has an impact on how people feel, think, and carry out their daily activities. The condition may also affect a person's ability to enjoy life, appetite, and sleep patterns. When there's social support, people are happier and this reduce depression.
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Find each percentage of 75. Explain your reasoning.
1. What is 10% of 75?
2. What is 1% of 75?
3. What is 0.1% of 75?
4. What is 0.5% of 75?
Answer:
1. 7.5
2. 0.75
3. 0.075
4. 0.375
Step-by-step explanation:
Yw, and have a good day to everyone who reads this <3 :)
the triangles are simialr solve for the question mark
you need to show the problem
x+10=y, then 45 is equal to
Determine the equation of the parabola that opens up, has vertex (-4,-8)(−4,−8), and a focal diameter of 1616.
The equation of parabola will be;
⇒ y = 4 ( x + 4)² - 8
What is an expression?
Mathematical expression is defined as the collection of the numbers variables and functions by using operations like addition, subtraction, multiplication, and division.
Given that;
The vertex = (- 4, - 8)
And, The focal diameter = 16
Now,
Since, The vertex (h, k) = (- 4, - 8)
And, The focal diameter (4a) = 16
⇒ 4a = 16
⇒ a = 4
Hence, The equation of parabola with vertex (h, k) will be;
⇒ y = a (x - h)² + k
Substitute all the values, we get;
⇒ y = 4 (x - (-4))² + (-8)
⇒ y = 4 ( x + 4)² - 8
Thus, The equation of parabola will be;
⇒ y = 4 ( x + 4)² - 8
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Sam had 1 whole 1/2 m 5/8 m used it for a project. how much rope does San have left.
Sam has 7/8 m of rope left.
What is fraction ?
Any number of equal parts is represented by a fraction, which also represents a portion of a whole. A fraction, such as one-half, eight-fifths, or three-quarters, indicates how many components of a particular size there are when stated in ordinary English.
In mathematics, a fraction is used to denote a portion or component of the whole. It stands for the proportionate pieces of the whole. Numerator and denominator are the two components that make up a fraction. The numerator is the number at the top, and the denominator is the number at the bottom.
To derive a solution, you have to subtract the meter of rope that Sam has from the meter of rope he cut for a project.
Therefore,
1½ - 5/8,
Since the meter of rope Sam had is represent with a mixed fraction, we have to convert it to an improper fraction, and therefore 1½ can also be written as 3/2
Therefore, we have
3/2 – 5/8
To solve this fraction, you need to find the smallest number that can divide the denominator (2 and 8), which is 8.
Now divide the denominators with 8 and multiply the answers you get by the numerators.
Therefore, we have
3/2 -5/8
= 12/8 – 5/8
= 7/8 m.
Therefore, Sam has 7/8 m of rope left.
The smallest number used to divide the denominators is also known as the lowest common denominator (LCD).
A fraction has 2 parts, which are numerator and denominator. The numerator is the number at the top in a fraction while the denominator is the number below in a fraction.
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Denise earns $225 a week with a part time job at the local florist. She decides to put 30% of the amount into a saving account. How much money does Denise put in the savings account each week?
Denise puts $67.50 in the savings account every week.
What is a percentage?
Percentages are essentially fractions where the denominator is 100. To show that a number is a percent, we use the percent symbol (%) besides the number. For example, if you got 75 questions right out of 100 on a test (75/100), you would have scored 75%.
To find out how much money Denise puts in the savings account each week, you need to multiply her weekly earnings by the percentage she puts into the savings account.
First, convert the percentage to a decimal by dividing by 100: 30% = 0.30
Then, multiply Denise's weekly earnings by this decimal to find the amount she puts into the savings account each week:
=$225 * 0.30
=67.50.
Hence, Denise puts $67.50 in the savings account each week.
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You are preparing to purchase some items online. You have a total of $320 to spend. You see several styles of shoes you like and each pair costs $16. You also like several pairs of jeans and each pair costs $32. You want to purchase more than 6 items. Let x represent the number of pairs of shoes you can buy, and y represent the number of pairs of jeans you can buy. In terms of this scenario, what does the point (9 , 1) mean?
, You are preparing to purchase some items online. You have a total of $320 to spend. You see several styles of shoes you like and each pair costs $16. You also like several pairs of jeans and each pair costs $32. You want to purchase more than 6 items. Let x represent the number of pairs of shoes you can buy, and y represent the number of pairs of jeans you can buy. In terms of this scenario, what does the point (9 , 1) mean?
The point (9 , 1) means you cannot buy 10 items total.
The point (9 , 1) means you can buy 9 pairs of jeans and 1 pair of shoes.
The point (9 , 1) means you can buy 9 pairs of shoes and 1 pair of jeans.
The point (9 , 1) means you cannot buy 9 pairs of shoes and 1 pair of jeans.
In terms of this scenario, the point (9 , 1) means B. The point (9 , 1) means you can buy 9 pairs of jeans and 1 pair of shoes.
How to illustrate the equation?An equation is the statement that illustrates the variables given. In this case, two or more components are taken into consideration to describe the scenario.
In this case, you have a total of $320 to spend. You see several styles of shoes you like and each pair costs $16. You also like several pairs of jeans and each pair costs $32. You want to purchase more than 6 items.
Let x represent the number of pairs of shoes you can buy, and y represent the number of pairs of jeans you can buy.
The point (9 , 1) means you can buy 9 pairs of jeans and 1 pair of shoes. This can be illustrated as:
9($32) + 1($16)
= $282 + $16
= $298
The correct option is B.
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A. How many cube with an edge length of b. What i the volume, in cubic inche, of inch are needed to build a cube with one cube with an edge length of inch? an edge length of 1 inch?
In order to build a cube with an edge length of b inches, b3 cubes with 1-inch edges are required.
What are cubes?A cube is a three-dimensional object with six square faces that are all the same size and form in mathematics. A cube has perpendicular sides and is symmetrical along all three axes. Finding the area of one of a cube's faces and increasing it to the third power yields the volume of the object. V=s3, where s denotes one of the cube's sides, is the formula for calculating a cube's volume. Cubes are frequently used in geometry and algebra, and they have a wide range of real-world uses, including volume measurement and the solution of mathematical equations.
How to solve?
The volume of a cube with an edge length of b inches is b3 cubic inches. For instance, if b=3, we would require 33=27 cubes with 1 inch-long edges, and the volume of a cube with a three inches edge would be 33=27 cubic inches.
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Cameron has papayas and bananas in a ratio of 6:19. How many bananas does he have if he has 36 papayas?
Answer: 113 bananas
Step-by-step explanation:
The ratio is 6:19, with 6 papayas for every 19 bananas.
We have 36 papayas, which is 6 times, so we just need to get 19 times 6 = 113 bananas
What types of values of the test statistic for the kruskal wallace test support the alternative hypothesis?.
Answer:
that at least one of the distributions function is not equal.