Therefore, the positive predictive value of screening test 1 is 27.87%.
The prevalence of a disease is 12% in population X (n = 10,000). Two screening tests have been developed for this disease. Individuals first undergo screening test 1, which has a sensitivity of 85% and a specificity of 70%. Those who test positive on screening test 1 undergo screening test 2, which has a sensitivity of 90% and a specificity of 80%.What is the positive predictive value of screening test 1?A screening test is a medical test given to large groups of people to identify those who have a disease. It is a statistical measure that helps to identify those who have a disease from those who do not. Sensitivity and specificity are two major measures used to determine the effectiveness of a screening test. Sensitivity refers to the percentage of people with the disease who test positive on the screening test. The formula for sensitivity is: Sensitivity = True Positive / (True Positive + False Negative) × 100%The sensitivity of screening test 1 is 85%, which means that of the people with the disease, 85% will test positive on screening test 1.Specificity refers to the percentage of people without the disease who test negative on the screening test. The formula for specificity is: Specificity = True Negative / (True Negative + False Positive) × 100%The specificity of screening test 1 is 70%, which means that of the people without the disease, 70% will test negative on screening test 1.The positive predictive value (PPV) is the probability that a person who tests positive on the screening test actually has the disease. The formula for PPV is :PPV = True Positive / (True Positive + False Positive) × 100%To calculate the PPV of screening test 1, we need to know the prevalence of the disease and the number of people who test positive on screening test 1. The prevalence of the disease in population X is 12%, which means that 1200 people have the disease in a population of 10,000 people. Using the sensitivity and specificity of screening test 1, we can calculate the number of true positive and false positive cases as follows :True Positive = Sensitivity × Prevalence × Total population= 0.85 × 0.12 × 10,000= 1020False Positive = (1 - Specificity) × (1 - Prevalence) × Total population= 0.3 × 0.88 × 10,000= 2640Now that we know the number of true positive and false positive cases, we can calculate the PPV of screening test 1 as follows :PPV = True Positive / (True Positive + False Positive) × 100%PPV = 1020 / (1020 + 2640) × 100%PPV = 27.87%.
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The diameter of a circular cookie cake is 16 inches. How many square inches make up half of the cookie cake? Approximate using π = 3.14.
100.48 square inches make up half of the cookie cake. The solution has been obtained by using area of circle.
What is area of circle?
The territory that a circle's circumference encloses or includes is referred to as its area. The square is its unit of measurement.
We are given that the diameter of a circular cookie cake is 16 inches.
Area of circle = π \(r^{2}\)
The radius (r) = 8 inches
So, from this we get
⇒ Area of circle = π \(8^{2}\)
⇒ Area of circle = 64 * 3.14
⇒ Area of circle = 200.96 square inches
So, half cookie cake = 100.48 square inches
Hence, 100.48 square inches make up half of the cookie cake.
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if I have a 68% overall and I get a A+ on a final exam that is worth 20% of my grade what would my grade be? There is 86 questions on the final
Answer:
i guess your new grade would be 88%. If you past 100%, you might pass for that grade. Even if you get a 90%, you'll still be able to pass.
Step-by-step explanation:
Jaden made 6 L of corn soup for hid birthday a bowl can hold 200 ML of soup how many bowls can he fill
Answer:
30
Step-by-step explanation:
1L=1000
6L=?
6×1000= 6000ML
a soup can hold 200ML
6000/200
= 30
Step-by-step explanation:
Jaden has made a total of 6000 ML (6 L x 1000 ML/L = 6000 ML) of corn soup.
To find out how many bowls he can fill, we need to divide the total amount of soup by the amount of soup that can fit in one bowl.
6000 ML ÷ 200 ML/bowl = 30 bowls
Therefore, Jaden can fill 30 bowls with his 6 L of corn soup.
Simplify
3√b^2
and no it is not 3b
The simplified form of the given expression is 9b
Simplifying an ExpressionFrom the question, we are to simplify the given expression
The given expression is 3√b^2
This expression can be properly written as
(3√b)²
To simplify the expression,
First, we will expand the expression by applying one of the rules of exponents
(3√b)²
Applying the rule of exponent
3² × (√b)²
9 × b
= 9b
Hence,
The simplified expression is 9b
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A small radio transmitter broadcasts in a 61 mile radius. If you drive along a straight line from a city 68 miles north of the transmitter to a second city 81 miles east of the transmitter, during how much of the drive will you pick up a signal from the transmitter?
To solve this problem, we need to find the intersection of the circle with a 61-mile radius centered at the transmitter and the straight line connecting the two cities.
First, let's draw a diagram of the situation:
r
Copy code
T (transmitter)
|\
| \
| \
| \
| \
| \
| \
| \
C1 C2
Here, T represents the transmitter, C1 represents the city 68 miles north of the transmitter, and C2 represents the city 81 miles east of the transmitter. We want to find out how much of the straight line from C1 to C2 is within the range of the transmitter.
To solve this problem, we need to use the Pythagorean theorem to find the distance between the transmitter and the straight line connecting C1 and C2. Then we can compare this distance to the radius of the transmitter's range.
Let's call the distance between the transmitter and the straight line "d". We can find d using the formula for the distance between a point and a line:
scss
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d = |(y2-y1)x0 - (x2-x1)y0 + x2y1 - y2x1| / sqrt((y2-y1)^2 + (x2-x1)^2)
where (x1,y1) and (x2,y2) are the coordinates of C1 and C2, and (x0,y0) is the coordinate of the transmitter.
Plugging in the values, we get:
scss
Copy code
d = |(81-0)*(-68) - (0-61)*(-68) + 0*0 - 61*81| / sqrt((81-0)^2 + (0-61)^2)
= 3324 / sqrt(6562)
≈ 41.09 miles
Therefore, the portion of the straight line from C1 to C2 that is within the range of the transmitter is the portion of the line that is within 61 miles of the transmitter, which is a circle centered at the transmitter with a radius of 61 miles. To find the length of this portion, we need to find the intersection points of the circle and the line and then calculate the distance between them.
To find the intersection points, we can solve the system of equations:
scss
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(x-0)^2 + (y-0)^2 = 61^2
y = (-61/68)x + 68
Substituting the second equation into the first equation, we get:
scss
Copy code
(x-0)^2 + (-61/68)x^2 + 68(-61/68)x + 68^2 = 61^2
Simplifying, we get:
scss
Copy code
(1 + (-61/68)^2)x^2 + (68*(-61/68))(x-0) + 68^2 - 61^2 = 0
Solving this quadratic equation, we get:
makefile
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x = 12.58 or -79.23
Substituting these values into the equation for the line, we get:
scss
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y = (-61/68)(12.58) + 68 ≈ 5.36
y = (-61/68)(-79.23) + 68 ≈ 148.17
Therefore, the intersection points are approximately (12.58, 5.36) and (-79.23, 148.17). The distance between these points is:
scss
Copy code
sqrt((12.58-(-79.23))^2 + (5.36-148.17)^2)
≈
135 inches or 11 feet which one is bigger I need a detailed answer
Answer:
135 in
Step-by-step explanation:
convert inches to feet
11*12=132
135>132
135 inches are longer
\(Find \: H.C.F \: of \: \\ 900 \: , 270 \\ using \: e.d.l \: \\ ( \: Euclid's \: division \: lemma \: )\)
H.C.F of 900 & 270
Answer:
90Step-by-step explanation:
Factorize both numbers:
900 = 2*2*3*3*5*5270 = 2*3*3*3*5Common factors are:
2*3*3*5So HCF is:
HCF(900, 270) = 2*3*3*5 = 90\(\Large \red \mid \: \underline {\rm {{{\color{blue}{Explanation...}}}}} \: \red \mid\)
We know that ,As per Euclid Division Algorithm.
\( \longrightarrow \: \Large\underbrace {\rm {{{\color{red}{ \: a \: = \: bq \: + \: r \: }}}}} \)
a denotes dividendb denotes divisorq denotes quotientr denotes remainder◆━━━━━▣✦▣━━━━━◆Using Euclid Division Algorithm\(\large\bf{\purple{ \hookrightarrow \: }} \tt \: \: 900 \: = \: 270 \: \times \: 3 \: + \: 90\)
Here ,\(\large\bf{\orange{ \implies \: }} \: \:r \: \neq \: 0\)
Again Applying Euclid Division Algorithm
\(\large\bf{\purple{ \hookrightarrow \: }} \tt \: 270 \: = \: 90 \: \times \: 3 \: + \: 0\)
Here ,\(\large\bf{\orange{ \implies \: }} \: \:r \: = \: 0\)
As the reminder is 0 , 90 will be the greatest common divisor for the two given numbers.
So,\({\boxed{ \Large{ \blue{ \bf{ \underline{ HCF \: = \: 90}}}}}}\)
◆━━━━━▣✦▣━━━━━◆x + y =7 What is the answer show your work
Answer:
x = 3y = 4.There are infinite solutions. I'll just give you this solution.Step-by-step explanation:
Given equation:
x + y = 7Solve for variables:
7 - x = y7 - 3 = 47 - y = x7 - 4 = 3.Answers:
x = 3y = 4.Find the slope given the points (-2,-9) and (-1,-3).
will give brainliest!!!!
Answer:
The slope is 6
Step-by-step explanation:
Y2-Y1 / X2-X1
-3-(-9) / -1-(-2)
6
Answer:
m = 6
Step-by-step explanation:
slope (m) = rise / run
rise = y2 - y1 = -3 - (-9) = 6
run = x2 - x1 = -1 - (-2) = 1
slope = 6/1 = 6
Write an equation of the line that passes through each pair of points
\((\stackrel{x_1}{-10}~,~\stackrel{y_1}{4})\qquad (\stackrel{x_2}{2}~,~\stackrel{y_2}{-5}) \\\\\\ \stackrel{slope}{m}\implies \cfrac{\stackrel{rise} {\stackrel{y_2}{-5}-\stackrel{y1}{4}}}{\underset{run} {\underset{x_2}{2}-\underset{x_1}{(-10)}}} \implies \cfrac{-9}{2 +10} \implies \cfrac{ -9 }{ 12 }\implies -\cfrac{3}{4}\)
\(\begin{array}{|c|ll} \cline{1-1} \textit{point-slope form}\\ \cline{1-1} \\ y-y_1=m(x-x_1) \\\\ \cline{1-1} \end{array}\implies y-\stackrel{y_1}{4}=\stackrel{m}{-\cfrac{3}{4}}(x-\stackrel{x_1}{(-10)}) \implies y -4= -\cfrac{3}{4} (x +10) \\\\\\ y-4=-\cfrac{3}{4}x-\cfrac{15}{2}\implies y=-\cfrac{3}{4}x-\cfrac{15}{2}+4\implies {\Large \begin{array}{llll} y=-\cfrac{3}{4}x-\cfrac{7}{2} \end{array}}\)
Select the type of line below (solid or dashed).Plot two points on the line.Click on the side that should be shaded.
Okay, here we have this:
Considering the provided inequation, we are going to graph it, following the required steps, so we obtain the following:
1.
The line will be solid as long as there is an equal, and dashed when not, therefore for this case as the inequality has a lesser or equal then it will be solid.
2.
For the vertical motion model h(t)=-16t^(2)+54t+3, identify the maximum height reached by an object and the amount of time the object is in the air to reach the maximum height. Round to the nearest tenth. Maximum height Time taken to reach the maximum height
The vertical motion model is h(t) = -16t² + 54t + 3The equation above is in the standard form of a quadratic equation which is given as y = ax² + bx + c.The maximum point of a parabola (quadratic equation) is always at the vertex of the parabola. The formula for finding the x-coordinate of the vertex is given by -b/2a.
Using the above formula to find the time taken to reach the maximum height, we can find the time by finding the x-coordinate of the vertex of the quadratic equation, t = -b/2a.Substitute a = -16, b = 54 into the formula:$$\begin{aligned} t &= \frac{-b}{2a}\\ &= \frac{-54}{2(-16)}\\ &= 1.69 \end{aligned}$$Therefore, the time taken to reach the maximum height is 1.69 seconds (rounded to the nearest tenth).To find the maximum height reached by the object, we need to substitute t = 1.69 into the equation and solve for h(t):$$\begin{aligned} h(t) &= -16t^2 + 54t + 3\\ &= -16(1.69)^2 + 54(1.69) + 3\\ &= 49.13 \end{aligned}$$
Therefore, the maximum height reached by the object is 49.1 feet (rounded to the nearest tenth).Maximum height reached by an object = 49.1 feetTime taken to reach the maximum height = 1.69 seconds
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The radius of a circle measures 5 milometers . What is the circumference of the circle? Use 3.14 for pi , and do not round your answer. Be sure to include the correct unit in your answer.
Answer:
circumference = 31.4 milometers
Step-by-step explanation:
circumference = 5(2)(π)
circumference = 31.4 milometers
What is (w-2)/w=3/6
w=?
Answer:
W=4
Step-by-step explanation:
A project has an initial cost of $30 million.The project is expected to generate a cash flow of $2.85 million at the end of the first year.All the subsequent cash flows will grow at a constant growth rate of 3.85% forever in future.If the appropriate discount rate of the project is 11%,what is the profitability index of the project? a.1.917 b.1.328 c.1.387 d.1.114 ortcehov e. None of the above
Profitability index is 1.387. Thus, the correct option is (c) 1.387.
The formula for calculating the profitability index is:
P.I = PV of Future Cash Flows / Initial Investment
Where,
P.I is the profitability index
PV is the present value of future cash flows
The initial investment in the project is $30 million. The cash flow at the end of the first year is $2.85 million.
The present value of cash flows can be calculated using the formula:
PV = CF / (1 + r)ⁿ
Where,
PV is the present value of cash flows
CF is the cash flow in the given period
r is the discount rate
n is the number of periods
For the first-year cash flow, n = 1, CF = $2.85 million, and r = 11%.
Substituting the values, we get:
PV = 2.85 / (1 + 0.11)¹ = $2.56 million
To calculate the present value of all future cash flows, we can use the formula:
PV = CF / (r - g)
Where,
PV is the present value of cash flows
CF is the cash flow in the given period
r is the discount rate
g is the constant growth rate
For the subsequent years, CF = $2.85 million, r = 11%, and g = 3.85%.
Substituting the values, we get:
PV = 2.85 / (0.11 - 0.0385) = $39.90 million
The total present value of cash flows is the sum of the present value of the first-year cash flow and the present value of all future cash flows.
PV of future cash flows = $39.90 million + $2.56 million = $42.46 million
Profitability index (P.I) = PV of future cash flows / Initial investment
= 42.46 / 30
= 1.387
Therefore, the correct option is (c) 1.387.
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Can someone please help me with this I only have two minutes to answer.
Answer:
(-2,1) and (3, -4)
Step-by-step explanation:
(-2,1) and (3, -4) this is where the lines intersect, hence these are the solution. :) have a great night!
I need help please ??
Answer:
a. 2(4*8 + 8*6 + 4*6)
2(32+48+24)
2(104)
208 in^2
b. 4*8*6 = 192 in^3
The Question: Find the measure of the angle marked with the question mark.
Please help me.
An investor has an account with stock from two different companies. Last year, her stock in Company A was worth $5800 and her stock in Company B was worth $7470. The stock in Company A has decreased 1% since last year and the stock in Company B has decreased 20%. What was the total percentage decrease in the investor's stock account? Round your answer to the nearest tenth (if necessary).
To find the total percentage decrease, we first need to find the new values of the stocks in Company A and Company B after the decrease.
The new value of the stock in Company A is: $5800 - (1% \times $5800) = $5742
The new value of the stock in Company B is: $7470 - (20% \times $7470) = $5976
To find the total value after the decrease, we add these two values: $5742 + $5976 = $11718
To find the percentage decrease from the original total value ($5800 + $7470 = $13270) to the new total value ($11718), we use the formula:
percentage decrease = [(original value - new value) / original value] x 100%
percentage decrease = [($13270 - $11718) / $13270] x 100%
percentage decrease = 11.7%
Therefore, the total percentage decrease in the investor's stock account is 11.7%.
The House of Representatives and the Senate make up which part of the federal government?
Answer: congress
Step-by-step
The first step in the legislative process is the introduction of a bill to Congress. Anyone can write it, but only members of Congress can introduce legislation. Some important bills are traditionally introduced at the request of the President, such as the annual federal budget. Planation:
Congress
Step-by-step explanation:The US congress is a combination of 2 components called the House of Representatives and the Senate.
Legislative Branch
The US government is made up of 3 branches. Both parts of Congress are a part of the legislative branch. The purpose of the legislative branch is to create laws. The houses of congress create bills and then vote on them to become laws. If a bill passes both the Senate and the House of Representatives, then it is eligible to become a law in the United States.
Differences between the Senate and House of Representative
While both the Senate and House are in Congress, they have slight differences. One of the main differences is the size of the bodies. The senate has 100 senators. Each state in America gets 2 senators. On the other hand, there are 435 representatives in the House. Representation in the House is based on the population of each state.
Pls answer need it ASAP
Answer:
a = 13.3
Step-by-step explanation:
Pythagorean theorem states that the sum of the squares on the legs of a right triangle is equal to the square on the hypotenuse.
c^2 = a^2 + b^2
15^2 = a^2 + b^2
a^2 = 15^2 - 7^2 = 225 - 49 = 176
a = √176 = 13.26 = 13.3
AC is a diameter of OE, the area of the
circle is 289 units2, and AB = 16 units.
Find BC and mBC.
B
A
C
E. plssss hurry !!
The measure of arc BC is 720 times the measure of angle BAC.
Given that AC is the diameter of the circle and AB is a chord with a length of 16 units, we need to find BC (the length of the other chord) and mBC (the measure of angle BAC).
To find BC, we can use the property of chords in a circle. If two chords intersect within a circle, the products of their segments are equal. In this case, since AB = BC = 16 units, the product of their segments will be:
AB * BC = AC * CE
16 * BC = 2 * r * CE (AC is the diameter, so its length is twice the radius)
Since the area of the circle is given as 289 square units, we can find the radius (r) using the formula for the area of a circle:
Area = π * r^2
289 = π * r^2
r^2 = 289 / π
r = √(289 / π)
Now, we can substitute the known values into the equation for the product of the segments:
16 * BC = 2 * √(289 / π) * CEBC = (√(289 / π) * CE) / 8
To find mBC, we can use the properties of angles in a circle. The angle subtended by an arc at the center of a circle is double the angle subtended by the same arc at any point on the circumference. Since AC is a diameter, angle BAC is a right angle. Therefore, mBC will be half the measure of the arc BC.
mBC = 0.5 * m(arc BC)
To find the measure of the arc BC, we need to find its length. The length of an arc is determined by the ratio of the arc angle to the total angle of the circle (360 degrees). Since mBC is half the arc angle, we can write:
arc BC = (mBC / 0.5) * 360
arc BC = 720 * mBC
Therefore, the length of the arc BC equals 720 times the length of the angle BAC.
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Suppose h(t) = -4t^2+ 11t + 3 is the height of a diver above the water (in
meters), t seconds after the diver leaves the springboard.
A. when does the diver hit the water?
Answer:
Step-by-step explanation:
When the diver hits the water the height, h(t), becomes zero. We set h(t) equal to zero and solve the resulting equation for t:
h(t) = -4t^2+ 11t + 3 = 0
The coefficients of this quadratic equation are {-4, 11, 3}, and so the discriminant (needed in the quadratic formula) is -11 - 4(-4)(3) = 47.
-11 ± √37 11 + √37 11 - √37
Therefore the roots are t = --------------, or t = ------------- or t = ---------------
-8 8 8
Both of these results are positive. Picture the graph as one opening down and intersecting the x-axis in two places. The diver hits the water (and h becomes zero) at the later time:
11 + √37
t = ---------------- sec (a little over 2 sec)
8
Geraldo recently saw a newspaper ad for a new version of his laptop. the projected price is $400.00, and the laptop will be out on the market in about one year. geraldo wants to purchase a new laptop but is wondering if he should wait a year. with 2.5% inflation, what amount would he pay to purchase a laptop today that is the same value as the one he saw in the ad? responses $390.24 $390.24 $397.30 $397.30 $390.00 $390.00 $397.50
The amount he would pay to purchase a laptop today that is the same value as the one he saw in the ad is $390.
Cost price: Cost prize is the price at which the goods and services were purchased.
It is given that,
projected price: $400.00, and the laptop will be out on the market in about one year with 2.5% inflation.
Now, if he pays today for a laptop of the same value as the one in the advertisement, his cost will be 2.5% of $400 less, or as follows:
cost price of laptop = $400 - 2.5& x 400
cost price of laptop = 97.5% x $400
cost price of laptop = $390
As a result, the laptop that he needs right now will cost $390.
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please help me answer this with solution
Answer:
Question 1:
\({ \tt{f(x) = {x}^{2} - 10x + 25}}\)
when f(x) is f(10), we substitute for x as 10; x = 10
\({ \tt{f(10) = {10}^{2} - 10(10) + 25 }} \\ { \tt{f(10) = 100 - 100 + 25}} \\ { \boxed{ \tt{ \: f(10) = 25 \: }}}\)
Question 2:
\({ \tt{f(x) = \frac{2 {x}^{3} - 7 }{10} }} \\ \)
when f(x) is f(-1), we substitute for x as -1; x = -1
\({ \tt{f( - 1) = \frac{2 {( - 1)}^{3} - 7 }{10} }} \\ \\ { \tt{f( - 1) = \frac{ - 2 - 7}{10} }} \\ \\ { \boxed{ \tt{ \: f( - 1) = - \frac{9}{10} \: }}}\)
first to answer correctly gets brainleist
Answer:
B is the answer
Step-by-step explanation:
A triangular pendant has two sides of length 23 mm and 31 mm. What are the possible lengths (in whole mm) for the third side?.
According to Pythagoras theorem, the value of the third side of the triangle is 38.6mm
In math Pythagoras theorem states that the square of the length of the hypotenuse is equal to the sum of squares of the lengths of other two sides of the right-angled triangle.
Here we have given that the triangular pendant has two sides of length 23 mm and 31 mm.
And we need to find the possible lengths (in whole mm) for the third side.
Here in the given question, we have the values of the two sides are 23mm and 31mm.
Then we have to apply the values on the Pythagoras theorem formula,
=> hypotenuse² = adjacent² + opposite²
Now, we have to apply the values as opposite and adjacent on it, then we get,
=> hypotenuse²= 23² + 31²
=> hypotenuse² = 529 + 961
=> hypotenuse² = 1490
Therefore, the value of the third side is 38.6mm
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Simplify to a single power of 5: 5^8/5^6
Answer:
5^8/5^6 = 5^(8-6) = 5^2 = 25. Therefore, 5^8/5^6 simplified to a single power of 5 is 25.
Step-by-step explanation:
Answer:
the answer for that is 5^6-3 = 5^3 = 125
Step-by-step explanation:
If x/y + y/x = -1 , find the value of x^3 - y^3
Answer:
0
Step-by-step explanation:
Multiplying the first equation by xy, we have ...
x^2 +y^2 = -xy
Factoring the expression of interest, we have ...
x^3 -y^3 = (x -y)(x^2 +xy +y^2)
Substituting for xy using the first expression we found, this is ...
x^3 -y^3 = (x -y)(x^2 -(x^2 +y^2) +y^2) = (x -y)(0) = 0
The value of x^3 -y^3 is 0.
Find the missing value for the following expression.
\frac{3}{5} = \frac{?}{15}
5
3
=
15
?
Answer:
is the missing value.
Answer:
9
Step-by-step explanation:
\(\frac{3}{5} = \frac{x}{15}\)
Cross multiply
\(45=5x\)
Divide both sides by 5
\(\frac{45}{5}=\frac{5x}{5}\)
x = 9
The missing value is 9
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