The committee can be selected by combinatorial argument in
[tex]\sum ^{n}_{k=1} k(^n_k).[/tex] ways.
A counting-based argument is known as a combinatorial argument or combinatorial proof. This line of reasoning has previously been used, for instance in the section on Stirling numbers of the second sort.
By initially selecting k individuals from our group of n, we can then choose one of those k individuals to serve as the committee's chairperson.
A number of methods for completing the first task, k methods for completing the second task, and so on. ways to create a k-member committee with a chairperson.
[tex]\sum ^{n}_{k=1} k(^n_k).[/tex] is the number of methods to construct a committee with a chairman of size less than or equal to n can be found by adding up over 1≤k≤n.
A committee of size less than or equal to n can also be formed with a chairperson by selecting the chairperson first, followed by the members of the committee. The chairperson can be chosen from among n options. The picker has two options for the remaining n-1 individuals: to include them or not. We therefore have n options for the chairperson, 2 options for the following, 2 options for the following, etc. These can be multiplied together to give us [tex]n2^{n-1}[/tex], which is a proof of the identity.
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the length of a rectangle is 15 cm more than the width. a second rectangle whose perimeter is 72 cm is 5cm wideer but 2cm shorter than the first rectangle. what are the dimensios of each rectangle?
the dimensions of each rectangle is 72.
What is perimeter?In geometry, a shape's perimeter is referred to as its total length. The perimeter of a form is determined by adding up the lengths of all of its sides and edges. Linear measurements like centimeters, meters, inches, and feet are used to indicate its dimensions.
EXPLANATION :
The length of a rectangle is 15 cm more than its width.
L - W = 15
Compared to the first rectangle, which has a circumference of 72 cm, the second is 2 cm smaller and 5 cm wider.
2(L-2) + 2(W+5) = 72
Simplify to get 36 L + W + 3 and 36 L + W, which equals 33 by multiplying L - 2 + W + 5 by 2.
Here, combine the two equations and apply elimination.
L - W = 15 \sL + W = 33
Using the initial length, L 2L = 48 L = 24 cm, we may find W = 24 - 15 W = 9 cm, so removing W. Second rectangle width: initial width 24 - 2 = 22 cm; second rectangle length: 9 + 5 = 14 cm.
Calculate the second rectangle's perimeter using the following equation: 2(22) + 2(14) = 44 + 28 = 72
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a vineyard has 145 acres of chardonnay grapes. a particular soil supplement requires 5.50 gg for every square meter of vineyard. how many kilograms of the soil supplement are required for the entire vineyard? (recall that 1 km2
3230 kilograms of the soil supplement are required for the entire vineyard;
1 km = 1000 m = 10³ m
1 km² = 1000000 m² = 10⁶ m²
1 km² = 247 acres
1 kg = 1000 g;
A vineyard has 145 acres of Chardonnay grapes.
145 acres = 145/247 km²
= 0.587 km²
A particular soil supplement requires 5.50 grams for every square meter of vineyard.
1 km² requires = 5.5 × 10³ kg
145 acres requires = 0.587 × 5.5 × 10³ kg = 3230 kg;
An annual percentage rate is expressed as an hobby charge. It calculates what percentage of the major you will pay every year by using taking things inclusive of month-to-month bills under consideration. APR is also the annual rate of interest paid on investments without accounting for the compounding of interest within that year.
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3y=-12x + 6
y=-4x + 2
no solution
1 solution
or
infinitely many solutions
The given equation 3y = -12x + 6 has infinitely many solutions.
The given equation 3y = -12x + 6 can be solved using the substitution method to determine whether this equation has no solution, 1 solution or infinitely many solutions.
Given equation,
3y = -12x + 6
Rearranging the terms of the equation, we get the value of y in terms of the variable x.
=> 3y = -12x + 6
=> y = -12x/3 + 6/3
=> y = -4x + 2
Next, we substitute this value of y in terms of the variable x in the original equation,
=> 3 ( -4x + 2 ) = -12x + 6
=> -12x + 6 = -12x + 6
=> -12x + 12x = 6 - 6
=> 0 = 0
From the obtained result, we can conclude that this system has infinitely many solutions. This implies, the lines are coincident and the system is consistent and dependent.
Therefore, it can be concluded that the given equation 3y = -12x + 6 has infinitely many solutions.
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Joyce buys a bus pass for the month of March for $32.55. How much does the bus pass cost per day?
Answer: $1.05
Step-by-step explanation:
March has 31 days
Hence,
[tex]\displaystyle\\32.55:31=\\\\32\frac{55}{100}*\frac{1}{31} =\\\\32\frac{11}{20} *\frac{1}{31} =\\\\\frac{(32)(20)+11}{(20)(31)} =\\\\\frac{640+11}{620} =\\\\\frac{651}{620}=[/tex]
$1.05
i have two 20-sided dice that each have 4 maroon sides, 7 teal sides, 8 cyan sides, and one sparkly side. if i roll both dice, what is the probability they come up the same?
The probability of color coming up the same for rolling two 20-sided dice is 129/400.
Probability is defined as how likely something is to happen. For a single dice, getting a maroon, teal, and cyan have a probability of 4/20, 7/20, and 8/20, respectively.
Before solving the probability, we must identify whether the events are considered independent or dependent. Independent events are when the probability of an event happening does not affect the other's event probability of happening. A dependent event is when the probability of an event happening affects the other event. The rolling of dice is considered an independent event.
For events that should occur together, the multiplication rule is used. To solve for the probability of two sides coming up the same, the formula below is used.
P (A and B) = P (A) * P (B)
P (red and red) = (4/20)*(4/20) = 1/25
P (teal and teal) = (7/20)*(7/20) = 49/400
P (cyan and cyan) = (8/20)*(8/20) = 4/25
Since no specific color was stated in the problem, the sum of the probability of each color coming up the same is determined.
P (color come up the same) = P (red and red) + P (teal and teal) + P (cyan and cyan)
P (color come up the same) = 1/25 + 49/400 + 4/25
P (color come up the same) = 129/400
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5/3 in decimal form
Algebra 1 question
Answer:
1.66...
Step-by-step explanation:
5/3=
5 * 1/3=
5 * 0.33...=1.66... ==> with bar on top of the 6
combine these radicals
Answer:
[tex]2 \sqrt{3} [/tex]
3 checks for $500 and 2 bills for $2000 with $5000 what is the ending balance
The ending balance based on the information given will be $2000.
How to calculate the value?From the information, it was stated that there are 2 checks for $500 and 2 bills for $2000 with $5000.
It should be noted that bill is a expense and will be deducted.
This will be illustrated as:
= $5000 + (2 × $500) - (2 × $2000)
= $5000 + $1000 - $4000
= $2000
Therefore, the ending balance based on the information given will be $2000.
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What is the midpoint of PQ
Answer:
Midpoint = (-0.5, 1)
Step-by-step explanation:
Midpoint formula is (x1 + x2)/2, (y1 + y2)
Lets plug that into the formula.
-4 + 3 = -1
x = -1/2 or -0.5
-1 + 3 = 2
2/2 = 1
y = 1
Final Answer: (-0.5, 1) or (-1/2, 1)
Water Lillies (continued)
A nearby lake also has water lilies. The ranger uses the equation = 90 · 2 to represent the number of water lilies in the lake each day.
4. Explain what the 90 and the 2 mean in this situation.
5. If both patterns continue, which will have more water lilies on day 6: the pond or the lake?
Explain your reasoning.
Answer:
Step-by-step explanation:
in the ambrose family, the ages of the three children are three consecutive even integers. if the age of the youngest child is represented by x 3, which expression represents the age of the oldest child?
The expression that represents the age of the oldest child is x +5
Consecutive integersIntegers are whole number and can be negative or positive. For instance, 1,2, 3, -5 are al integers.
Fractions cannot be an integers. From the question, we are told that the ages of the three children are three consecutive even integer. If the youngest child is represented by x + 3, the the others will be determine by simply adding 1 to each term
Middle child = x + 3 + 1
Middle child = x + 4
Oldest child = x + 4 + 1
Oldest child = x + 5
Hence the expression that represents the age of the oldest child is x +5
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Shandra is working two summer jobs, making $9 per hour washing cars and $8 per hour walking dogs. Last week Shandra worked a total of 11 hours and earned a total of $90. Write a system of equations that could be used to determine the number of hours Shandra worked washing cars last week and the number of hours she worked walking dogs last week. Define the variables that you use to write the system. Let Let ||| System of Equations:
Step-by-step explanation:
x=total hours for wahing cars
y=total hours for walking dogs
1. 9x+8y=90 (total money)
2. x+y=11 (total hours)
=>8x+8y=88
=> 1-2
=> x=2
therefore y=9
The number of hours for Shandra working to wash car is 2 hours.
The number of hours for Shandra working to walking dogs is 9 hours.
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;
Shandra is working two summer jobs, making $9 per hour washing cars and $8 per hour walking dogs.
Last week Shandra worked a total of 11 hours.
Total earned = $90
Now,
Total number of hours to wash car = x
Total number of hours to walk dogs = y
So, We can formulate;
⇒ 9x + 8y = $90 ... (I)
And, x + y = 11 .. (ii)
Solve equation (i) and (ii) we get;
x = 2 hours and y = 9 hours
So, The number of hours for Shandra working to wash car is 2 hours.
The number of hours for Shandra working to walking dogs is 9 hours.
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The length of a bacterial cell is about 5 x 10−6 m, and the length of an amoeba cell is about 3.5 x 10−4 m. How many times smaller is the bacterial cell than the amoeba cell? Write the final answer in scientific notation with the correct number of significant digits.
1.4 x 101
7 x 101
143 x 101
7 x 103
Bacterial cell is smaller than the amoeba cell by 70 times or 7^ 10 times
What is mathematical expression?
A mathematical expression is defined as the collection of the numbers variables and functions by using signs like addition, subtraction, multiplication, and division.
length of a bacterial cell = 5 x 10^-6 m
length of an amoeba cell = 3.5 x 10^-4 m
= 3.5 x 10^-4 x 100/100 m
= 350 x 10^-6 m
Now, comparing the length
= (350 x 10∧-6) / (5 x 10∧-6 )
= (350/5
= 70 times or 7^ 10 times
Therefore, bacterial cell is smaller than the amoeba cell by 70 times or 7^ 10 times
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Match each group of numbers with the appropriate group name.
13, 0.781781...
a.
b.,1.5, -56.25
c. √5, 1.1,
d. 0.-€,0.975
e. √9,-4,892
[Choose]
Whole Numbers
Positive Numbers
Repeating Decimals
Improper Fractions
Numbers Between -1 and 1
Repeating Decimals
27
Answer:
A . 6822 just divede 420 to 32 then times 562 tk 911
What is correct solution for this problem?
(x°) + (4x°) = 180°
Answer:hi how are you
Step-by-step explanation:
What is the area? Please help!!
Answer:
7.2
Step-by-step explanation:
The area of a rectangle is calculated by multiplying its width and length.
The length is already given as 13 cm and the area is given as 93.6 cm.
Now, to find the width we will divide the area by length:
93.6 ÷ 13 = 7.2
kirk made a scale drawing of the elementary school. the scale of the drawing was 3 millimeters : 4 meters. if the actual width of the schoolyard is 60 meters, how wide is the schoolyard in the drawing?
The width of the schoolyard in the drawing is 45 millimeter.
In the given statement is ,
kirk made a scale drawing of the elementary school. the scale of the drawing was 3 millimeters : 4 meters. if the actual width of the schoolyard is 60 meters.
To find the how wide is the schoolyard in the drawing
Now, According to the question:
and, Based on the given condition
Let width of the schoolyard in the drawing be x
So, 3 : 4 = x : 60
[If b/a = d/c, ad = bc]
3/4 = x/60
3 x 60 = 4x
x = 180/4
x = 45 millimeters
Hence, The width of the schoolyard in the drawing is 45 millimeter.
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Choose a mental math strategy, and find the difference between the speeds of the planets Neptune and Saturn
The difference between the speeds of the planets Neptune and Saturn is 9384 miles per hour.
What is speed?The distance traveled in a unit of time is called speed. It refers to a thing's rate of movement. The scalar quantity known as speed is the velocity vector's magnitude. It has no clear direction. The formula for an object's general speed is [Speed = Distance Time]. M/s is the SI unit of speed.
The speed of an item, which is a scalar quantity in everyday usage and kinematics, is the size of the change in that object's position over time or the size of the change in that object's position per unit of time.
Therefore, the difference between the speeds of the planets Neptune and Saturn will be:
= 21637 - 12253
= 9384 miles per hour.
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Simplify the following numerical expressions. |-7| - 7 = 2|-7| = (-7)2 = -72 = -7 -|-7| =
the answer of all the 5 expressions is given as : 0, 14, 49, -49, -14 respectively.
What is mathematic expression?
A mathematical expression is defined as the collection of the numbers variables and functions by using signs like addition, subtraction, multiplication, and division.
Here the given expression are :
1) |-7| - 7 :
now, here considering the modulus value of -7 as 7 that is positive only :
|-7| - 7 = 7-7 = 0
2) 2|-7| = 2x 7
2|-7| = 14
3) (-7)² = -7 x -7 = 49
4) -7² = -(7 x 7) = -49
5) -7 -|-7| = -7 - 7 = -14
it should be noted that we have considered only positive value of modulus function only.
Therefore, the answer of all the 5 expressions is given above.
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Calculate the value of y when the graph of y=-3x and x=-2 intercept
In a linear equation value of x and y (x, y) = ( -2 , 6) when the graph of y=-3x and x=-2 intercept .
What in mathematics is a linear equation?
There are only one or two variables in a linear equation. No variable can be multiplied by a number larger than one or used as the denominator of a fraction in a linear equation. All of the points fall on the same line when you identify the values that together make a linear equation true and plot those values on a coordinate grid.y= - 3x
Put x = -2 put in the equation
y = -3 * -2
y = 6
So, value of x and y (x,y) = ( -2 , 6)
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HELP ASAP
easy stuff
The relation between the linear and recursive functions are given as follows:
f(n) = -n < - > {-1,-2,-3,-4...}, where f(1) = 1 and f(n + 1) = f(n - 1) - 1 for n > 1.f(n) = 2n - 3 < - > {-1,1,3,5...}, where f(1) = -1 and f(n + 1) = f(n - 1) + 2 for n > 1.f(n) = -n + 5 < - > {4,3,2,1...}, where f(1) = 4 and f(n + 1) = f(n - 1) - 1 for n > 1.f(n) = 2n + 2 < - > {4,6,8,10...}, where f(1) = 4 and f(n + 1) = f(n - 1) + 2 for n > 1.What is a linear function and how does it relate to a recursive function?A linear function is modeled according to the following rule:
f(x) = mx + b
In which:
m is the slope of the function, which is the rate of change of the function, that is, the change in y divided by the change in x.b is the y-intercept of the function, which is the the value of y when the function crosses the x-axis, that is, when x = 0.Considering the concepts of a linear function, the recursive function is given as follows:
f(n) = f(n - 1) + m for n > 1. f(1) for n = 1. (numeric value of the linear function when x = 1).The linear function with first term -1 and slope -1 is given by:
f(n) = -n.
Hence:
f(n) = -n < - > {-1,-2,-3,-4...}, where f(1) = 1 and f(n + 1) = f(n - 1) - 1 for n > 1.
The linear function with first term -1 and slope 2 is given by:
f(n) = 2n - 3
Hence:
f(n) = 2n - 3 < - > {-1,1,3,5...}, where f(1) = -1 and f(n + 1) = f(n - 1) + 2 for n > 1.
The linear function with first term 4 and slope -1 is given by:
f(n) = -n + 5
Hence:
f(n) = -n + 5 < - > {4,3,2,1...}, where f(1) = 4 and f(n + 1) = f(n - 1) - 1 for n > 1.
The linear function with first term 4 and slope 2 is given by:
f(n) = 2n + 2
Hence:
f(n) = 2n + 2 < - > {4,6,8,10...}, where f(1) = 4 and f(n + 1) = f(n - 1) + 2 for n > 1.
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Solve the following quadratic equation: (8x+7)(x+1)=9
Answer:
[tex]x=\dfrac{1}{8}, \quad x=-2[/tex]
Step-by-step explanation:
Given equation:
[tex](8x+7)(x+1)=9[/tex]
Expand the brackets:
[tex]\implies 8x^2+15x+7=9[/tex]
Subtract 9 from both sides:
[tex]\implies 8x^2+15x+7-9=9-9[/tex]
Simplify:
[tex]\implies 8x^2+15x-2=0[/tex]
To factor a quadratic equation in the form [tex]ax^2+bx+c[/tex], find two numbers that multiply to [tex]ac[/tex] and sum to [tex]b[/tex]:
[tex]\implies ac=8 \cdot -2=-16[/tex]
[tex]\implies b=15[/tex]
Therefore, the two numbers are: 16 and -1.
Rewrite [tex]b[/tex] as the sum of these two numbers:
[tex]\implies 8x^2+16x-x-2=0[/tex]
Factor the first two terms and the last two terms separately:
[tex]\implies 8x(x+2)-1(x+2)=0[/tex]
Factor out the common term (x + 2):
[tex]\implies (8x-1)(x+2)=0[/tex]
Apply the zero-product property:
[tex]\implies 8x-1=0 \implies x=\dfrac{1}{8}[/tex]
[tex]\implies x+2=0 \implies x=-2[/tex]
Therefore, the solutions to the given quadratic equation are:
[tex]x=\dfrac{1}{8}, \quad x=-2[/tex]
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Answer:
x = 1/8 (or) x = -2
Step-by-step explanation:
Now we have to,
→ solve the following quadratic equation.
Let's solve for quadratic equation,
→ (8x+7)(x+1) = 9
→ 8x² + 7x + 8x + 7 - 9
→ 8x² + 15x - 2
→ 8x² + 16x - x - 2
→ 8x(x + 2) - 1(x + 2)
→ (8x - 1)(x + 2)
→ x = 1/8 (or) x = -2
Hence, the solution is x = 1/8, -2.
SECOND TIME ASK9INIG PLEASE HELP
EASY POINTS WILL GIVE BRAINLIST TO BEST ANSWER
What is the result of solving this equation for t ?
Mt – 5ab = nRT
explain!!
Answer:
t = nRT/M + 5ab/M
Step-by-step explanation:
I'm going to assume that the t and T are seperate variables.
basically all you have to do is isolate t by dividing each side with factors that do not contain the t
Point e is on line segment DF given ef =16 and DF=19
In a line segment DF with point e somewhere on the line, ef = 16 and ed = 3.
We have given a line segment DF with a point e on the line segment
We have been informed that ef = 16 and DF = 19
We know that
⇒ DF = ed + ef
⇒ ed = DF - ef
= 19 - 16
= 3 units
What is line segment?
This line segment has two ends with defined lengths, A and B. This line segment's length is equal to the distance between its ends, A and B.
A line segment is hence a section or component of a line with two endpoints. A line segment, unlike a line, has a set length.
Measuring the length of a line segment can be done using either metric measurements, such as millimeters or centimeters, or conventional measurements, such as feet or inches.
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Full question
Point e is on line segment DF given ef =16 and DF=19. Find ed.
HELP!!
what is the answer to number 18
Answer:
c
Step-by-step explanation:
The number of solutions of the equation [tex]5x^2+7x-4=0[/tex] is 2. Option (c) is correct.
Further explanation:
The Fundamental Theorem of Algebra states that the polynomial has n roots if the degree of the polynomial is n.
The polynomial function has n roots or zeroes.
Given:
The equation is [tex]f(x)=5x^2-7x-4=0[/tex]
According to the Fundamental Theorem of Algebra the function has 2 roots
Solve the above equation to obtain the zeros.
[tex]x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}[/tex]
[tex]x=\frac{-7\pm \sqrt{7^2-4\cdot \:5\left(-4\right)}}{2\cdot \:5}[/tex]
[tex]\sqrt{7^2-4\cdot \:5\left(-4\right)}[/tex]
[tex]=\sqrt{129}[/tex]
[tex]x_1=\frac{-7+\sqrt{129}}{2\cdot \:5},\:x_2=\frac{-7-\sqrt{129}}{2\cdot \:5}[/tex]
so, x has 2 solutions
Answer:
options c
Step-by-step explanation:
I hope it's helpful for you to
what will the coordinates of the image be if point a (5;4) is reflected along the y-axis
Answer:
(-5,4)
Step-by-step explanation:
when the coordinate is reflection it stays the same number but is change to the opposite (-/+)
reflecting over the y-axis flip the X coordinate (-5,4)
reflecting over the x-axis flip the Y coordinate (5,-4)
-6/25 divided by 5 2/5 answer has to be a fraction and needed in simplest form
Answer:
-2/45
Step-by-step explanation:
Which two numbers on the number line have an absolute value of 2.75?
Select the location of both numbers on the number line.
Two numbers on the number line have an absolute value of 2.75 is -2.75 and 2.75
number line - A line on which numbers are marked at intervals and used to illustrate simple numerical operations.
center of the number line is called origin i.e. 0 (zero) positive numbers are on the right side of zero. negative numbers are on the left side of the zero.absolute value - absolute value of real number is its distance from the zero.
The absolute value of 2.75 is 2.75 and the absolute value of -2.75 is 2.75
Two numbers on the number line have an absolute value of 2.75 is -2.75 and 2.75
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the tunnel opening shown is a semicircle. find the area to the nearest tenth, of the opening tunnel enclosed by the semi circle. (semi circle is 23 feet.)
A semicircle is a one-dimensional locus of points that forms half of a circle.
The area of the semicircle is 10796.9 square feet.
What is a semicircle?A semicircle is a one-dimensional locus of points that forms half of a circle.
Its area is half the area of a circle.
We have,
The radius of the semicircle is 23 feet.
The figure is given below.
The area of a semicircle is given by:
= πr² / 2
r = radius
π = 22/7 = 3.14
So,
The area of the semicircle tunnel:
= (3.14 x 23 x 23) / 2
= 10796.89
Rounding to the nearest tenth.
= 10796.9 square feet
Thus the area of the semicircle is 10796.9 square feet.
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The two triangles below are similar.
Calculate the value of x.
Give your answer as an integer or as a fraction in its simplest form
15 mm
C
3 mm
xmm
D
10 mm
Not drawn accurately
Answer:
50mm
Step-by-step explanation:
From the smaller to the larger:
Let s + the scale factor
3s = 10 Divide both sides by 3
s = [tex]\frac{10}{3}[/tex]
15[tex](\frac{10}{3})[/tex] = [tex]\frac{150}{3}[/tex] = 50