a) Yes, this provide strong evidence that more than 15% of college students in America have at least one sibling
b) Type of error might you have committed is type 1 error.
We can use the sample proportion of students with at least one sibling (20/100 = 0.2) to calculate a test statistic, which measures how far the sample proportion is from the null hypothesis. In this case, we can use a one-sample proportion z-test to calculate the test statistic:
z = (p1 - p) / √(p * (1 - p) / n)
where p1 is the sample proportion, p is the null hypothesis proportion, and n is the sample size.
Using the values from your question, we get:
z = (0.2 - 0.15) / √(0.15 * 0.85 / 100) ≈ 1.18
We can use a standard normal distribution to find the p-value, which is the probability of getting a test statistic as extreme as the one we observed, assuming the null hypothesis is true. The p-value can be calculated as:
p-value = P(Z > z)
where Z is a standard normal random variable.
Using a calculator or a table of standard normal probabilities, we can find that the p-value is approximately 0.12.
To make a decision about whether to reject or fail to reject the null hypothesis, we compare the p-value to a significance level, which is a threshold that we set to determine how much evidence we need to reject the null hypothesis.
The most common significance level is 0.05, which means that we are willing to accept a 5% chance of rejecting the null hypothesis when it is actually true.
In this case, the p-value (0.12) is greater than the significance level (0.05), so we fail to reject the null hypothesis. This means that we do not have strong evidence to conclude that more than 15% of college students in America have at least one sibling based on this sample.
Now, let's talk about the type of error that we might have committed when testing the hypothesis. In hypothesis testing, there are two types of errors: type I error and type II error.
A type I error occurs when we reject a true null hypothesis, and a type II error occurs when we fail to reject a false null hypothesis.
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in a survey, 13 people were asked how much they spent on their child's last birthday gift. the results were roughly bell-shaped with a mean and standard deviation of $36 and $15, respectively. construct a confidence interval at a 95% confidence level. give your answers to one decimal place. answer should be written in e format.
Answer:
Sure. Here are the steps on how to construct a confidence interval at a 95% confidence level for the mean amount spent on a child's last birthday gift:
Identify the sample size, n. In this case, n=13.
Identify the sample mean,
x
ˉ
. In this case, $\bar{x} = $36.
Identify the sample standard deviation, s. In this case, $s = $15.
Identify the t-critical value, t. The t-critical value is the value that cuts off 2.5% of the distribution in each tail, leaving 95% of the distribution in the middle. To find the t-critical value, we need to know the degrees of freedom, df. The degrees of freedom are calculated as df=n−1. In this case, df=13−1=12.
We can find the t-critical value using a t-distribution table. The t-distribution table shows the t-critical values for different degrees of freedom and different confidence levels. For a 95% confidence level and 12 degrees of freedom, the t-critical value is 2.179.
Calculate the confidence interval. The confidence interval is calculated as follows:
$\bar{x} \pm t \cdot \frac{s}{\sqrt{n}}$
In this case, the confidence interval is:
$36 \pm 2.179 \cdot \frac{15}{\sqrt{13}} = (27.28, 44.72)$
Therefore, a 95% confidence interval for the mean amount spent on a child's last birthday gift is $27.28 to $44.72.
Step-by-step explanation:
Help Will give BRAINLYST How many years will it take mr sanchez to have 10,568.52 in the college fund ,if mr sanchez does not make any deposits or withdrawals
Answer:
16 years
Step-by-step explanation:
We can use the formula for compound interest to solve this problem:
A = P(1 + r/n)^(nt)
where A is the final amount, P is the principal (initial amount), r is the annual interest rate (as a decimal), n is the number of times per year the interest is compounded, and t is the number of years.
In this case, P = $5000, r = 0.05 (since the annual interest rate is 5%), n = 12 (since the interest is compounded monthly), and we need to solve for t when A = $6,568.52.
Plugging in the values, we get:
$6,568.52 = $5000(1 + 0.05/12)^(12t)
Dividing both sides by $5000 and taking the natural logarithm of both sides, we get:
ln(1.313704) = ln(1 + 0.05/12)^(12t)
Using the logarithmic identity ln(a^b) = b ln(a), we can simplify the right side:
ln(1.313704) = 12t ln(1 + 0.05/12)
Dividing both sides by 12 ln(1 + 0.05/12), we get:
t = ln(1.313704) / (12 ln(1 + 0.05/12)) = 16.0
Therefore, it will take Mr. Sanchez 16 years to have $6,568.52 in the college fund, if he does not make any deposits or withdrawals. The answer is 16 years.
Help please DUE TONIGHT ! You have been contracted to paint the grain silo pictured below find the combined surface area of the top and sides of the sail to determine the amount of paint needed for the job note there is no need to paint the bottom of the silo as it is resting on the ground the height of the right cylinder is twice it’s diameter round ur answer to the nearest whole number
90π m² is the combined surface area of the top and sides of the sail to determine the amount of paint needed for the job note there is no need to paint the bottom of the silo
We know that t = 12m
t= 2×diameter
12=2×diameter
6=diameter
Radius = 3m
Combined surface area = 2πrt+1/2×4πr²
=2π(3)(12)+1/2×4π(9)
=72π+18π
=90π m²
Hence, 90π m² is the combined surface area of the top and sides of the sail to determine the amount of paint needed for the job note there is no need to paint the bottom of the silo
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Which graph corresponds to the table below? x -3 -1 0 1 2 y 6 5 4 3 1 Post Test: Exponential Relationships
The graph that correctly represents the data in the table for this problem is given as follows:
Top right graph.
How to obtain the y-intercept of a function?On the definition of a function, the y-intercept is given by the value of y for which the input assumes a value of zero.
Hence, on the graph of a function, the y-intercept is the value of y for which the graph touches or crosses the y-axis.
From the table, we have that when x = 0, y = 4, hence the graph should cross the y-axis at y = 4, hence the top right graph is the correct option in the context of this problem.
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write the expression as a single logarithm log{3} 40 -log{3} 10 show all steps very clearly please
Answer:
Use the quotient property of logarithms, logb(x)−logb(y)=logb(xy) log b ( x ) - log b ( y ) = log b ( x y ) . log3(4010) log 3 ( 40 10 ). Step 2.
Point O is between points M and N on line segment MN. O is the midpoint of line segment MN if
OOM=NM
O ON=NM
O ON OM
O ON+OM = MN
When point O is between points M and N on line segment MN. O is the midpoint of line segment MN if
O ON + OM = MN
What is midpoint of a line segment?In geometry the midpoint is the point that divides a line segment into two equal parts
It is the point that is equal distance from both endpoints of the segment.
In this case the endpoints are M and N, the midpoint is point O, which is the point that is halfway between M and N, so that ON = OM. and adding the points returns the original line MN
Therefore, we have that ON + OM = MN
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How to Draw a table of values for the first 6 natural numbers.
To draw a table of values for the first 6 natural numbers, draw the rows and columns and input the numbers 1, 2, 3, 4, 5, and 6 against the variables being compared.
How to draw the tableA table is a visual representation that is used to compare two or more variables. To draw this sort of table for natural numbers, you need to insert 6 rows to contain all of the numbers.
The number of columns that will e drawn depends on the variable or variables that you are checking. The first 6 natural numbers are numbers 1 to 6.
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Determine the input value for which the statement f(x) = g(x) is true. From the graph, the input value is approximately . f(x) = 3 and g(x) = x – 2 3 = x – 2 5 = x The x-value at which the two functions’ values are equal is . please
explanation
Note that the input value for which the statement f(x) = g(x) is true are
3.5 and 10/3
How is this so?In this question , we have a graph given, and we have to find the x coordinate of the intersection point .
From the graph , the input value is approximately 3.3 .
In the graph, f(x) = 3
And for g(x), we need the slope and y intercept .
Slope is the ratio of rise and run .
Here rise equals 3 units and run equals 2 units. And the graph touch the y axis at -2 .
So the equation of g(x) = (3/2)x - 2
Since we need to factor f(x) = g(x)
Substituting the values of the two functions, we will get
3 = (3/2)x - 2
Adding 2 to both sides
5 = (3/2)x
Cross multiply and you have
10 = 3x
x = 10/3
So the input value for which the statement f(x) = g(x) is true are
3.5 and 10/3
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20 points for answering this
Answer: 90
Step-by-step explanation:
The rectangular floor of a classroom is 28 feet in length and 24 feet in width. A scale drawing of the floor has a length of 7 inches. What is the perimeter, in inches, of thefloor in the scale drawing?
Answer:
To find the perimeter of a scale drawing, we need to use the same scale factor that was used to create the drawing. In this case, the scale factor is 7 inches: 28 feet, or 1 inch: 4 feet. This means that every inch in the drawing represents 4 feet in the actual floor.
To find the perimeter of the floor in the scale drawing, we need to add up the lengths of all the sides. Since the floor is rectangular, it has two pairs of equal sides. The length of the floor is 28 feet, so the length of the scale drawing is 28 / 4 = 7 inches. The width of the floor is 24 feet, so the width of the scale drawing is 24 / 4 = 6 inches.
The perimeter of the scale drawing is then:
7 + 6 + 7 + 6 = 26 inches
MARK AS BRAINLIEST!!! THIS TOOK A LOT OF TIME!!!
Draw a function that has the following asymptotic behaviors.
A. At x=-3
as x→ - 3, y→∞ and as x→ - 3*, y→∞
The exponential function has a horizontal asymptote at y = –3 will be; f (x) = –3^x – 3.
We get a horizontal asymptote for a function;
Note that the x-axis (y=0) is the horizontal asymptote.
Since the question asked for a function with asymptotic behaviors of y = -3,
we can shift the function 3 units above by changing Q to +3.
The exponential function has a horizontal asymptote at y = –3 will be;
f (x) = –3^x – 3.
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Nakeisha is raising money for a school trip by selling lollipops and fruit snacks. The price of each lollipop is $1.50 and the price of each fruit snack is $1.25. Yesterday Nakeisha made $18.25 from selling a total of 13 lollipops and fruit snacks. Determine the number of lollipops sold and the number of fruit snacks sold.
Nakeisha sold 8 lollipops and 5 fruit snacks yesterday to earn a total of $18.25.
Let's use a system of equations to solve this problem. Let x be the number of lollipops sold and y be the number of fruit snacks sold. From the problem, we know that:
- The price of each lollipop is $1.50, so the total amount of money earned from selling x lollipops is 1.5x.
- The price of each fruit snack is $1.25, so the total amount of money earned from selling y fruit snacks is 1.25y.
- Yesterday, Nakeisha made $18.25 from selling a total of 13 lollipops and fruit snacks, so we can write the equation:
1.5x + 1.25y = 18.25
We also know that Nakeisha sold a total of 13 lollipops and fruit snacks, so we can write the equation:
x + y = 13
Now we have two equations with two variables, which we can solve using substitution or elimination. Let's use substitution:
- Rearrange the second equation to solve for one variable in terms of the other:
x + y = 13
y = 13 - x
- Substitute y = 13 - x into the first equation:
1.5x + 1.25y = 18.25
1.5x + 1.25(13 - x) = 18.25
- Simplify and solve for x:
1.5x + 16.25 - 1.25x = 18.25
0.25x = 2
x = 8
- Substitute x = 8 back into y = 13 - x to find y:
y = 13 - x
y = 13 - 8
y = 5
Therefore, Nakeisha sold 8 lollipops and 5 fruit snacks yesterday to earn a total of $18.25.
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Solve the following pairs of simultaneous equations
(a) x+y=5,xy=x+3
(b) 2x+y=5, x² + y² =10
The pairs of simultaneous equations have their x and y values to be (a) x+y=5 and xy=x+3: (1, 4) and (2, 3) & (b) 2x+y=5 and x² + y² =10: (x, y) = (1, 3) and (3, -1)
Solving the pairs of simultaneous equationsFrom the question, we have the following parameters that can be used in our computation:
(a) x+y=5 and xy=x+3(b) 2x+y=5 and x² + y² =10The pairs of simultaneous equations can be solved using a graphical method
Using the above as a guide, we have the following:
(a) x+y=5 and xy=x+3
x and y values:
(x, y) = (1, 4) and (2, 3)
(b) 2x+y=5 and x² + y² =10
x and y values:
(x, y) = (1, 3) and (3, -1)
See attachment for graphs
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Which could be Brooke’s sixth quiz score? Select three options. 85
90
83
86
92
The solution is: 90, 86, 92 and 89 could be Brooke’s sixth quiz score
Here, we have,
step 1
Find the mean
To do this, add all the numbers, then divide by the number of numbers there are.
so
mean = 85.60
step 2
if after taking the sixth quiz, Brooke’s mean score increased
then
the sixth score of Brooke's quiz must be higher than the mean obtained in the first 5 quizzes
case a)
85 < 85.60------> is not a solution
case b)
90 > 85.60------> is a solution
case c)
83< 85.60------> is not a solution
case d)
86 > 85.60------> is a solution
case e)
92 > 85.60------> is a solution
case f)
89 > 85.60------> is a solution
so, we get,
the answers are
90, 86, 92 and 89
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the complete question is
Brooke has scores of 84, 72, 90, 95, and 87 on her first five quizzes. After taking the sixth quiz, Brooke’s mean score increased.
Which could be Brooke’s sixth quiz score? Check all that apply.
85
90
83
86
92
89
The crank AB is rotating with a
constant angular velocity of =4 rad/s. Determine the angular velocity of the
connecting rod CD at the instant angle =30
The angular velocity of the connecting rod is w = 1.939 rad/s
Given data ,
To determine the angular velocity of the connecting rod CD at the instant angle θ = 30 degrees, we need to consider the relationship between the angular velocities of different components in a mechanism. In this case, we can use the concept of relative velocity
The angular velocity of the connecting rod CD can be found using the following equation
ω_CD = ω_AB + ω_BC
angular velocity of CD = angular velocity of AB x (AB/CD) x sin(u) x (1/cos(u))
angular velocity of CD = 4 rad/s x (10/20) x sin(30) x (1/0.825)
Therefore , the angular velocity is CD = 1.939 rad/s
Hence , the angular velocity is w = 1.939 rad/s
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what is the fomula of perimeter, area and volume
There are several formulas for finding the area, volume, and perimeter of different shapes. Some examples are: [tex]P = 2(l + w)[/tex], [tex]A = lw[/tex], and [tex]V = lwh[/tex]
What are the formulas to find the perimeter, area and volume of the different geometric figures?Perimeter:
Perimeter of a rectangle: [tex]P = 2(l + w)[/tex] where l is the length and w is the width.Perimeter of a square: [tex]P = 4s[/tex] where s is the length of a side.Perimeter of a circle: [tex]P = 2\pi r[/tex] where r is the radius.Area:
Area of a rectangle: [tex]A = lw[/tex] where l is the length and w is the width.Area of a square: [tex]A = s^2[/tex] where s is the length of a side.Area of a circle: [tex]A = \pi r^2[/tex] where r is the radius.Volume:
Volume of a rectangular prism: [tex]V = lwh[/tex] where l is the length, w is the width, and h is the height.Volume of a cube: [tex]V = s^3[/tex] where s is the length of a side.Volume of a cylinder: [tex]V = \pi r^2\pi[/tex] where r is the radius and h is the height.Note: This question is incomplete. Here is the complete question:
What is the formula of perimeter, area and volumen of rectangle, square, and circle
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May 03, 2023
i) y = -1/2x² + 6x + 5
2
Step-by-step explanation:
To evaluate y when x = 2 in the equation y = -1/2x² + 6x + 5, we simply substitute x = 2 into the equation and solve for y:
y = -1/2(2)² + 6(2) + 5
y = -1/2(4) + 12 + 5
y = -2 + 12 + 5
y = 15
Therefore, when x = 2, y = 15 in the equation y = -1/2x² + 6x + 5.
Gaurav bought 500 mangoes for Rs. 1000. He then packed them into small boxes with 25 in each. If each box is sold for Rs. 60, how much profit is made
Gaurav bought 500 mangoes for Rs. 1000, which means that he bought each mango for Rs. 2.
He packed the mangoes into small boxes with 25 in each, so he made a total of 500/25 = 20 boxes.
He sells each box for Rs. 60, so he makes a total of 20 x Rs. 60 = Rs. 1200 from selling all the boxes.
To find the profit, we need to subtract the cost of the mangoes from the total revenue.
The cost of 500 mangoes was Rs. 1000, so the profit is:
Profit = Rs. 1200 - Rs. 1000 = Rs. 200
Therefore, Gaurav made a profit of Rs. 200 by selling the mangoes.
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As the project progresses, the actual finish times (AFs) of completed activities will determine
the earliest start and earliest finish times for the remaining activities in the network diagram, as well as the total slack.
As the project progresses, the actual finish times (AFs) of completed activities play a crucial role in determining various aspects of the project schedule.
The AFs are used to calculate the earliest start and earliest finish times for the remaining activities in the network diagram. These calculations are based on the dependencies between activities and the actual durations of completed activities.
By considering the AFs, the project team can determine the earliest possible start and finish times for the remaining activities, taking into account the sequence of activities and any imposed constraints. This information helps in managing the project schedule and identifying any potential delays or critical paths.
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50 POINTSS! I NEED HELPP if the coach bases her decisions on the player Who is most consistent, whom should she choose? Justify your answer using measures of variability
If the coach was to pick the player based on the best average, the coach would choose Jessie.
If the coach is picking based on who has been the most consistent, they would pick Sam.
How the coach would decide ?The average for Jessie is :
= ( 150 + 145 + 181 + 235 + 196 + 211 + 204 + 221 + 185 ) / 9
= 192 points
The average for Sam :
= ( 186 + 187 + 192 + 195 + 194 + 157 + 157 + 162 + 200 ) / 9
= 181 points
The coach would pick Jessie based on average.
For consistency, we can use the measure of variability of range. The range for Jessie is:
= 235 - 145
= 90 points
The range for Sam would be:
= 200 - 157
= 43 points
This shows that Sam is more consistent and so would be picked based on consistency.
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answer the questions please
The probability that the number is in set B is 20 %.
The probability that the number is in the set A ∪ B is 30 %.
What is the probability of the number chosen?If a number is chosen at random from the universal set, the probability that the number is in set B is calculated as follows;
The total number of outcome = {1, 2, 3, 4, 5, 6, 7, 8, 9 , 10} = 10 numbers
The numbers in set B = { 3, 7}
The probability = 2/10 = 1/5 = 20%
The probability that the number is in the set A ∪ B is calculated as follows;
A ∪ B = { 2, 3, 7 }
The probability = 3/10 = 30%
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58 = 7x - 5
What is X?
Answer:
9
Step-by-step explanation:
Answer:
x = 9
Step-by-step explanation:
58 = 7x -5
Add + 5 to both sides
58+5 = 7x - 5 + 5
63 = 7x + 0
63 = 7x
Divide both sides by 7 to isolate the variable x.
63/7 = 7x/7
9 = x
So x = 9.
Check your answer:
7(9) - 5 = 63-5 = 58 so it works!
How do you do this question? Please help right now.
Answer:
The surface area of the right triangular prism is 168 cm².
Step-by-step explanation:
The formula for the surface area of a right triangular prism is SA=bh+pl, where p=b+h+c
P=b+h+c
P=4+3+5
=12
SA=bh+pl
SA=(4)(3)+(12)(13)
SA= 12+156
SA=168 cm²
For more information on how to find the surface are of right triangular prisms, check out "Triangular Prism - Volume, Surface Area, Base and Lateral Area Formula, Basic Geometry" by the Organic Chemistry Tutor.
Hope this helps!
378=63t please i need help??
Answer: 6
Step-by-step explanation:
If you divide both sides by 63 it isolates the t and leaves you with 6=t.
What percent of Mr. Reyes total compensation was withheld for federal taxes?
The percentage of Mr. Reyes total compensation that was withheld for federal taxes is given as follows:
14.2%.
How to calculate the percentage?From the table, we have that the parameters for this problem are given as follows:
Mr. Reyes total compensation: $61,987.50.Amount withheld for federal taxes purposes: $8,802.26.Hence the proportion of Mr. Reyes total compensation that was withheld for federal taxes is given as follows:
8802.26/61987.5 = 0.142.
Then the percentage is given as follows:
0.142 x 100% = 14.2%.
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Which numbers in set ={1 2 3 4 5 6 7 8 9 10} are elements in both the subset of odd numbers and the subset of multiples of 3?
The numbers that are elements of both the subset of odd numbers and the subset of multiples of 3 are 3 and 9.
The odd numbers in the set are {1, 3, 5, 7, 9} and the multiples of 3 in the set are {3, 6, 9}.
The elements that are in both subsets are the ones that appear in both sets, which are only 3 and 9.
Therefore, the numbers 3 and 9 are the elements that are in both the subset of odd numbers and the subset of multiples of 3.
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hey can someone help me pls *ANSWER ASAP*
This is a translation of 2 units to the left and 5 units up, so the correct option is the first one.,
Which is the translation applied?Remember that a vertical translation of N units is:
g(x) = f(x) + N
if N < 0 the translation is down.
if N > 0 the translation is up.
And a horizontal translation of N units is:
g(x) = f(x + N)
If N > 0 the translation is to the right.
if N < 0 the translation is to the left.
Here we have the transformation:
f(x) = x²
g(x) = (x + 2)² + 5
So this is a translation of 2 units to the left and 5 units up.
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Jackie earned a total of $9 by selling 3 cups of lemonade. How many cups of lemonade does Jackie need to sell in all to earn $18? Assume the relationship is directly proportional
Answer:
6 cups
Step-by-step explanation:
When two things are directly proportional (e.g. y and x), we can model the relationship with the direct variation equation, which is
y = kx, where
k is the constant of proportionalityStep 1: To find k, we can allow y to represent Jackie's total revenue from selling lemonade ($9) and x to represent the quantity of cups of lemonade sold ($3):
9 = 3k
k = 3
Step 2: Now that we've found the constant of proportionality, we can plug in 18 for y and 3 for k, allowing us to solve for x:
18 = 3x
6 = x
Thus, in order for Jackie to earn $18, she must sell 6 cups in all.
Ivan is an artist. He creates 1 sculpture for every 6 paintings. If he has created 54 paintings, how many sculptures has he created?
A.)324
B.)9
C.)252
D.)42
Ivan has created 9 sculptures.
We know, ratio is a comparison between two quantities or numbers. It expresses how many times one quantity is contained in another or how the two quantities relate to each other.
To find the number of sculptures he has created, we need to divide the number of paintings by the ratio of paintings to sculptures.
Number of paintings: 54
Ratio of paintings to sculptures: 6 paintings : 1 sculpture
Number of sculptures
= Number of paintings / Ratio of paintings to sculptures
= 54 / (6/1)
= 54 / 6
= 9
Therefore, Ivan has created 9 sculptures.
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how many different triangles with sides measuring 3,4, and 5 exist?
There is only one triangle with sides measuring 3, 4, and 5.
How to know how many triangles that can be formedWhen no side is specified, an infinite number of triangles are created.
If side lengths are not given, the three angles will result in an infinite number of triangles that are unique.
In this case the three sides of the triangle are specified and condition like this leads to formation of one unique triangle which a right triangle
This is a well known right triangle, the sides given is also known as a Pythagorean triple.
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