Determine how many integer solutions there are to
x₁ + x₂ + x3 + x₁ = 20, if
0≤x₁ < 3, 0≤ x₂ < 4, 0≤x3 <5, 0≤x4 < 6
Based on the information given, there are a total of 118 solutions.
How many possible solutions are there?This is a problem of solving a Diophantine equation subject to some conditions. Let's introduce a new variable y4 = 20 - (x1 + x2 + x3 + x4). Then the problem can be restated as finding the number of solutions to:
x1 + x2 + x3 + y4 = 20
Subject to the following conditions:
0 ≤ x1 < 3
0 ≤ x2 < 4
0 ≤ x3 < 5
0 ≤ y4 < 6
We can solve this problem using the technique of generating functions. The generating function for each variable is:
(1 + x + x^2) for x1
(1 + x + x^2 + x^3) for x2
(1 + x + x^2 + x^3 + x^4) for x3
(1 + x + x^2 + x^3 + x^4 + x^5) for y4
The generating function for the equation is the product of the generating functions for each variable:
(1 + x + x^2)^3 (1 + x + x^2 + x^3 + x^4 + x^5)
We need to find the coefficient of x^20 in this generating function. We can use a computer algebra system or a spreadsheet program to expand the product and extract the coefficient. The result is: 1118
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Answer: This problem involves finding the number of non-negative integer solutions to the equation x₁ + x₂ + x3 + x₁ = 20 subject to the given constraints. We can use the stars and bars method to solve this problem.
Suppose we have 20 stars representing the sum x₁ + x₂ + x3 + x₁. To separate these stars into four groups corresponding to x₁, x₂, x₃, and x₄, we need to place three bars. For example, if we have 20 stars and 3 bars arranged as follows:
**|**||
then the corresponding values of x₁, x₂, x₃, and x₄ are 2, 4, 6, and 8, respectively. Notice that the position of the bars determines the values of x₁, x₂, x₃, and x₄.
In general, the number of ways to place k identical objects (stars) into n distinct groups (corresponding to x₁, x₂, ..., xₙ-₁) using n-1 separators (bars) is given by the binomial coefficient (k+n-1) choose (n-1), which is denoted by C(k+n-1, n-1).
Thus, the number of non-negative integer solutions to the equation x₁ + x₂ + x3 + x₁ = 20 subject to the given constraints is:
C(20+4-1, 4-1) = C(23, 3) = 1771
However, this count includes solutions that violate the upper bounds on x₁, x₂, x₃, and x₄. To eliminate these solutions, we need to use the principle of inclusion-exclusion.
Let Aᵢ be the set of non-negative integer solutions to the equation x₁ + x₂ + x3 + x₁ = 20 subject to the given constraints, where xᵢ ≥ mᵢ for some integer mᵢ. Then, we want to find the cardinality of the set:
A = A₀ ∩ A₁ ∩ A₂ ∩ A₃
where A₀ is the set of all non-negative integer solutions to the equation x₁ + x₂ + x3 + x₁ = 20, and Aᵢ is the set of solutions that violate the upper bound on xᵢ.
To find the cardinality of A₀, we use the formula above and obtain:
C(20+4-1, 4-1) = 1771
To find the cardinality of Aᵢ, we subtract the number of solutions that violate the upper bound on xᵢ from the total count. For example, to find the cardinality of A₁, we subtract the number of solutions where x₂ ≥ 4 from the total count. To count the number of solutions where x₂ ≥ 4, we fix x₂ = 4 and then count the number of solutions to the equation x₁ + 4 + x₃ + x₄ = 20 subject to the constraints 0 ≤ x₁ < 3, 0 ≤ x₃ < 5, and 0 ≤ x₄ < 6. This count is given by:
C(20-4+3-1, 3-1) = C(18, 2) = 153
Similarly, we can find the cardinalities of A₂ and A₃ by fixing x₃ = 5 and x₄ = 6, respectively. Using the principle of inclusion-exclusion, we obtain:
|A| = |A₀| - |A
Step-by-step explanation:
Identify the next number in the following sequence
25 49 97 ?
Select only one answer
- 124
- 171
- 139
- 193
Answer:
the correct answer is 193
Step-by-step explanation:
25×1-0=25
25×2-1=49
49×2-1=97
97×2-1=193
the volume of a rectangle prism is 8cm height 4 width.
Answer:
Step-by-step explanation:
What is (2, 4) and (5, −2) in point-slope formula to slope-intercept form
Answer:
Here ig
Step-by-step explanation:
Which Judicial branch make the laws
Answer:The legislative branch
Step-by-step explanation:
Given the geometric series 6+3+3/2….Find
(i) the sum of n terms.
(ii) S infinity. Hence, determine smallest value of n such that S infinity - Sn < 0.001.
12-12[1-(1)]<0.001
The least value is 11.
\($$\begin{aligned}&\mathrm{S}=\frac{1}{1-(1 / 2)}=2 \\&\mathrm{~S}_{\mathrm{n}}=\frac{1-(1 / 2)^{\mathrm{n}}}{1-(1 / 2)}=2-\frac{1}{2^{\mathrm{n}-1}}\end{aligned}$$\)
\($$\mathrm{S}-\mathrm{S}_{\mathrm{n}}=\frac{1}{2^{\mathrm{n}-1}} < \frac{1}{1000} \text { or } 2^{\mathrm{n}-1} \geq 1000$$\)
Now \($2^{10}=32 \times 32=1024$\)
\($$\therefore n-1 \geq 10 \text { or } n \geq 11$$\)
Hence the least value is 11.
If you have a positive term in your quadratic equation, it will also have a minimum value. This minimum value can be found by graphing the function or solving one of the two equations. If you have the equation y = a\(x^2\) + bx + c, you may use the equation min = c - \(b^2\)/4a to determine the minimum value.
A quadratic equation is a second-order polynomial equation in a single variable x a\(x^2\)+bx+c=0. with a ≠ 0 . The fundamental theorem of algebra assures that it has at least one solution because it is a second-order polynomial equation.
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help pls
Find the volume of the composite solid.
Answer:
80cm3
Step-by-step explanation:
volume of the composite solid=volume of the
pyramid+
volume of the
cuboid
volume of the pyramid=1/3* base area*height
=1/3*5*4*6
=40cm3
volume of the cuboid=base area *height
=5*4*2
=40cm3
volume of the composite solid=40cm3+40cm3
=80cm3
Please help! Thank you!!!!!
9514 1404 393
Answer:
f(x) = x² -3g(x) = 6x +7h(x) = 3^xStep-by-step explanation:
f(x) is copied from the problem statement.
g(x) is a symbolic representation of the English wording, using x to represent "a number."
h(x) is the exponential function that corresponds to the geometric sequence in the table. It has a common ratio of 3, and a multiplier of 1 at x=0.
The chart below shows conversion between gallons in fluid ounces what is the missing value in the table?
Answer:
768
Step-by-step explanation:
a gallon = 128 fluid ounces so 6 gallons would be 768 fluid ounces
Answer:
Step-by-step explanation:
Use an associative law to find an expression equivalent to
s + (r + 75)
As you can see below, both expressions result in the same value of 105. This demonstrates the application of the associative law in regrouping terms and maintaining the equivalence of the expression.
The associative law in mathematics states that the grouping of numbers in an addition or multiplication operation does not affect the result. In other words, you can regroup terms within parentheses without changing the value of the expression.
Using the associative law, we can regroup the terms in the expression s + (r + 75) by removing the parentheses and rearranging the terms:
s + (r + 75) = (s + r) + 75
The expression (s + r) + 75 is equivalent to s + (r + 75) because the addition operation is associative.
Let's take an example to illustrate this:
Suppose s = 10 and r = 20.
Using the original expression:
s + (r + 75) = 10 + (20 + 75) = 10 + 95 = 105
Using the expression with regrouped terms:
(s + r) + 75 = (10 + 20) + 75 = 30 + 75 = 105
As you can see, both expressions result in the same value of 105. This demonstrates the application of the associative law in regrouping terms and maintaining the equivalence of the expression.
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Question 1 of 5
A community orchestra is losing money. They have always sold tickets for
$12, but they decide to increase the price by $3. For their next concert, they
sell 200 tickets at the increased price.
Select the expression representing the amount of money earned from ticket
sals.
A. 200(12-3)
B. 200(12) + 3
C. 200(12+3)
D. 200(12) - 3
Answer:
200 (12+3)
Step-by-step explanation:
They sold 200 tickets at a price of (12+3)
200 (12+3)
A triangle ABC has coordinates for A (-4, 1).
Triangle A'B'C' has coordinates for A' (0-3)
What is the translation?
How many units right or left and how many units up or down?
Choose the best answer from the options below:
A
B
C
D
4 right, 4 down
4 left, 4 up
You have 1 hour to answer this question or you will be logged out.
4 left, 4 down
4 right, 4 up
The solution is Option A.
The coordinate of the triangle after the translation is given by A' ( 0 , -3 ) with 4 units right and 4 units down
What is Translation?A translation moves a shape up, down, or from side to side, but it has no effect on its appearance. A transformation is an example of translation. A transformation is a method of changing a shape's size or position. Every point in the shape is translated in the same direction by the same amount.
Given data ,
Let the coordinate of the triangle be represented as A
Now , the coordinate A = A ( -4 , 1 )
Now , the coordinate of the triangle after translation is A' ( 0 , -3 )
when there is a translation of the coordinate A by 4 units to the right , we get
A to 4 units right = A ( -4 + 4 , 1 )
The new coordinate of A = A ( 0 , 1 )
Now , A to 4 units down , we get
The coordinate of A' = A' ( 0 , 1 - 4 )
The coordinate of A' = A' ( 0 , -3 )
Hence , the translated coordinate is A' ( 0 , -3 )
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Here's what Gabriel and Kayla actually wrote.
Gabriel: 3x+6
Kayla: 3(x+2)
These expressions are equivalent.
What do you think that means?
Which equation has a slope of -2 and passes through the point (1,-6)?
A. y=-2x-4
B. y=-10x+3
C. y=3x-10
D. y=3x+10
Answer:
y=-2x-4
Step-by-step explanation:
Given that,
Slope, m = -2
It passes through the point (1,-6).
We need to find the equation of line that passes throgh the given point. It can be calculated as:
\(y-y_1=m(x-x_1)\)
Put y₁ = -6, x₁ = 1 and m = -2
\(y-(-6)=(-2)(x-1)\\\\y+6=-2x+2\\\\y+2x+6-2=0\\\\y=-2x-4\)
Hence, the equation of line is y=-2x-4.
.Given logb^3 = 1/4 what is logb^9
Answer:
1/2
Step-by-step explanation:
Find the domain of the inequality: \(\left \{ {{b > 0} \atop {b\neq 1}} \right.\)
Solve the inequality: b > 0
Convert inequality to equation: b = 1
Solve the equation: b = 1
Convert equation to inequality: b ≠ 1
Find the intersection: 0 < b < 1 or b > 1
The domain of the inequality is: \(\text{log}_b3=\frac{1}{4} ,0 < b, < b < 1\) or\(b > 1\)
Convert logarithm to exponential form: \(b^{\frac{1}{4} }\) = 3, 0 <b<b1 or b > 1
Power on both sides: (b^1/4)^4=3^4, 0<b<1 or b > 1
Simplify using exponent rule (a^n)^m = a^nm:
b = 3^4, 0<b<1 or b > 1
Calculate the power:
b = 81 , 0<b<1 or b > 1
Find the intersection: b = 81
Substitute: \(\text{log}_{81}9\)
Factorize the argument: \(\text{log}_{81} 3^2\)
Express the logarithm of a power of an expression as the power times the logarithm of the expression: \(2*\text{log}_{81} 3\)
Factorize the base: \(2*\text{log}x_{3^4} 3\)
Rewrite the expression using the formula: \(\text{log}_{a^n} b\)
to \((\frac{1}{n} ) \text{log}_ab:\) \(2*\frac{1}{4} *\text{log}_33\)
Apply the power law of logarithm to simplify the expression:
\(2*\frac{1}{4}\)
Reduce the expression to the lowest form:
\(\frac{1}{2}\)
Answer: 1/2
Answer:
\(\log_b9=\dfrac{1}{2}\)
Step-by-step explanation:
\(\textsf{Given}: \quad\log_b3=\dfrac{1}{4}\)
\(\textsf{To find }\log_b9, \textsf{ rewrite 9 as 3}^2:\)
\(\implies \log_b9=\log_b3^2\)
\(\textsf{Apply the Power log law}: \quad \log_ax^n=n\log_ax\)
\(\implies \log_b3^2= 2\log_b3\)
\(\begin{aligned}\textsf{If }\log_b3& =\dfrac{1}{4}\\\\ \implies 2 \log_b3 & =2 \times \dfrac{1}{4}\\\\ & = \dfrac{2}{4}\\\\ & = \dfrac{1}{2}\end{aligned}\)
\(\textsf{Therefore}: \quad\log_b9=\dfrac{1}{2}\)
Given the following expressions:
A.
53 ⋅ 5 − 4
B. 353 − 6
C.
(14) 3 ⋅ (14) 2
D. (−7) 5 (−7) 7
Answer:
A. 261
B. 347
c. 1176
d. 1715
Step-by-step explanation:
The perimeter of a rectangle is 90 feet, and the length is 32 feet. What is the width of the rectangle
Answer:
The width is 13
Step-by-step explanation:
Use the formula p=2(l+w)
w=P/2 - l = 90/2 - 32 = 13ft
Sort the angles as acute, right, obtuse, or straight.
The top angle is right (90 degrees, kinda looks like a bent elbow).
The 2nd is acute (smaller than 90, kind of 'cute' bc it's small).
The 3rd is obtuse (greater than 90, I have nothing corny to say, sorry).
4th is acute.
5th is straight because it's a straight line.
6th is also obtuse.
Have a good day :)
Nate has a deductible of $1,000 and a collision coverage limit of $5,000. He damages his car in an accident and it will cost $7,000 to repair. How much does Nate have to pay total out of pocket for this claim?
Nate has a deductible of $1,000, which means he is responsible for paying that amount out of pocket before his insurance coverage kicks in. The cost of repairing his car is $7,000, which exceeds his deductible.
However, Nate's collision coverage limit is $5,000, which is the maximum amount his insurance will cover for repairs.
Since the cost of repairs exceeds Nate's coverage limit, he will have to pay the difference between the coverage limit and the actual repair cost.
In this case, Nate's out-of-pocket expenses would be $7,000 (repair cost) - $5,000 (coverage limit) = $2,000.
Therefore, Nate will have to pay a total of $2,000 out of pocket for this claim, which includes his $1,000 deductible and the additional $1,000 that exceeds his coverage limit.
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At noon, a tank contained 8 in. of water. After several hours, it contained 2 in. of water. What is the
percent decrease of water in the tank?
Answer:
75%
Step-by-step explanation:
To find the percent decrease, use the percent change formula:
(difference / original) x 100
8 - 2 = 6, so the difference is 6.
Plug in the difference and original:
(6 / 8) x 100
= 75
So, the percent decrease is 75%
Refer to the sample data for pre-employment drug screening shown below. If one of the subjects is randomly selected, what is the probability that the test result is a false positive? Who would suffer from a false positive result? Why?
Pre-Employment Drug Screening Results
Positive test result
Negative test result
Drug Use Is Indicated
Drug Use Is Not Indicated
Subject Uses Drugs
46
8
Subject Is Not a Drug User
1
30
Question content area bottom
Part 1
The probability of a false positive test result is enter your response here.
(Round to three decimal places as needed.)
The probability of a false positive test result is approximately 0.1702 or 17.02%.
The person who will suffer from a false positive are the subjects who aren't drug users.
How to calculate the probabilityFrom the given data, we can see that there are a total of 46 + 1 = 47 positive test results, out of which 8 are false positives (i.e., the subject is not a drug user).
The probability of a false positive test result is:
Probability of false positive = Number of false positives / Total number of positive test results.
Probability of false positive = 8 / 47
Probability of false positive = 0.1702
Therefore, the probability of a false positive test result is approximately 0.1702 or 17.02%.
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Which equation has the solution x = 2?
A. 5x + 1 = 10
B. 4x - x = 4
C. 3x + 2 = 8
D. 2x - 3 = 9
Step-by-step explanation:
C. 3X + 2=8is the correct answer
hope it helps you have a good day
please mark me as brain list it is 100% correct
Answer:
Your answer is C
Step-by-step explanation:
(3 * 2) + 2
6 + 2 = 8
The 10 passengers on a small airplane have paid a total of $1,580 for the flight.
If an economy ticket cost $135 and a first-class ticket costs $250 , how many economy tickets were bought?
Answer:
8 people bought economy and 2 bought first class
Step-by-step explanation:
there are 10 person and total is 1580 so 250+ 9(135)=1460 which is wrong so we gonna try adding 2(250) and 8(135) which got us 1580
Find the perimeter and area
The perimeter and area of the figure are 41.50mm and 18.50mm².
What is meant by perimeter?The circumference of a shape is known as its perimeter. The lengths of all four sides must be added in order to get a rectangle's or square's perimeter. The sum of the lengths of all the sides in a rectangle is its perimeter, or P. A rectangle's opposite sides are equal, hence it has two equal lengths and two equal widths. The following formula is used to determine a rectangle's perimeter: Diameter is equal to the sum of the following dimensions: length, width, height, and width.
The perimeter of an enclosed space is referred to by the word. A house's property line is found on its outside.
Length of BD=√13²-2²
BD=√165
Length of DC=√36-4
=√32
Area of ABC=Area of ADB+ Area of ADC
=(1/2)(BD)(AD)+ (1/2)(DC)(AD)
=(1/2)(√165)(2)+(1/2)(√32)(2)
Area=√165+√32
=18.50
Perimeter=Perimeter of ADB+ Perimeter of ADC
=(13+2+√165)+(6+2+√32)
=23+√165+√32
=41.50
Therefore, the perimeter and area of the figure are 41.50mm and 18.50mm².
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WhicWhich is an equation of a direct proportion?h is an equation of a direct proportion?
An equation of a direct proportion is: A. y = 8x.
What is a proportion?A proportion can be defined as an equation which is typically used to represent (indicate) the equality of two (2) ratios. This ultimately implies that, proportions can be used to establish that two (2) ratios are equivalent and solve for all unknown quantities.
Mathematically, a direct proportion can be represented the following equation:
y = kx
Where:
y and x are the variables.k represents the constant of proportionality.In this context, we can reasonably infer and logically deduce that an equation of a direct proportion is y = 8x.
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Find the period of the function y = 2∕3 cos(4∕7x) + 2. Question 11 options: A) 7∕2π B) 4∕7π C) 3π D) 7∕4π
The period of the function y = 2∕3 cos(4∕7x) + 2. is 7/2π
How to determine the period of the function?The function is given as:
y = 2∕3 cos(4∕7x) + 2.
The above function is a cosine function
A cosine function is represented as:
y = A cos(B(x + C)) + D
Where the period is
Period = 2π/B
By comparing the equations, we have
B = 4/7
Substitute B = 4/7 in Period = 2π/B
Period = 2π/(4/7)
Express as product
Period = 2π * 7/4
Divide 4 by 2
Period = π * 7/2
Evaluate the product
Period = 7/2π
Hence, the period of the function y = 2∕3 cos(4∕7x) + 2. is 7/2π
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A shark swims 15 m below the surface. It descends an additional 13 m to catch its prey. Determine its depth below the surface
Answer:
28 m below the surface to catch its prey
What's the answer? How do you get to the answer?
scale factor of triangle is 20/7 = 2.8571 .
How can I figure out the scale factor of a triangle?To get the scale factor of two triangles, follow these steps:
1. Check that the two triangles are similar.
2-If the triangles are similar, identify the sides that match.
3. Subtract any known angle from the triangle and multiply the result by the matching (also known) angle in the second triangle.
As a result,
4- the scale factor is equalized by the division.
CALCULATION∵ To find scale factor of two triangle we divide the sides of the both sides
∴ the scale factor of triangle given will be 20/7 = 2.8571 .
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Suppose you walk in to buy a $30,000 car, and you are able to put $3,000 down. Your dealer initially offers $3,000 for your trade. You couldn't get to your bank in time, so you
finance through the dealer. They are currently able to offer you a 4% interest rate for 48 months.
1 4 points
Calculate what your car payment would be under these terms (within a dollar)
Type your answer
2
Determine the total interest you would pay over the life of the loan assuming the same situation as in #1 (within thn dollars).
The total amount paid by the customer will be $32,262.5 and the amount of the interest will be $ 2,262.5.
What is APR?APR on a credit card is the way of saying that the interest you are charged over a year is equal to roughly of your balance.
Suppose you walk in to buy a $30,000 car, and you are able to put $3,000 down.
Your dealer initially offers $3,000 for your trade.
You couldn't get to your bank in time, so you finance through the dealer.
They are currently able to offer you a 4% interest rate for 48 months.
After the down payment, the amount will be
P = $ 27,000
r = 4% = 0.00333
n = 48 months
Then the cost of the monthly payment will be
\(\rm MP = P r \times \dfrac{(1+r)^n}{(1+r)^n - 1}\\\\MP = 27000 \times 0.0033 \times \dfrac{(1 + 0.0033)^{48}}{(1+0.0033)^{48} - 1}\\\\MP = 609.63\)
Then the total amount paid by the customer will be
Total amount = 3000 + 609.63 × 48
Total amount = $ 32,262.5
Then the amount of the interest will be given as
Interest amount = $32,262.5 - $30,000
Interest amount = $ 2,262.5
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PLEASE HELP I HAVE AN EXAM TOMORROW
Answer:
Plug in 1ft/12in
This will give you 36 ft
Step-by-step explanation:
After plugging in, multiply across and simplify/divide and you get your answer