The output of the function is -1 when the input is 0
The value is -1
What is an Equation of a line?
The equation of a line is expressed as y = mx + b where m is the slope and b is the y-intercept
And y - y₁ = m ( x - x₁ )
y = y-coordinate of second point
y₁ = y-coordinate of point one
m = slope
x = x-coordinate of second point
x₁ = x-coordinate of point one
The slope m = ( y₂ - y₁ ) / ( x₂ - x₁ )
Given data ,
Let the equation of line be y - y₁ = m ( x - x₁ )
Now , let us find two points from the graph
Let the two points in the graph be A ( x₁ , y₁ ) and B ( x₂ , y₂ )
And ,
A ( x₁ , y₁ ) = A ( 2 , 0 )
B ( x₂ , y₂ ) = B ( -4 , -3 )
In order to find the slope of the line ,
The equation for slope is
Slope m = ( y₂ - y₁ ) / ( x₂ - x₁ )
Substituting the values , we get
Slope m = ( -3 - 0 ) / ( -4 - 2 )
= -3 / -6
= 1/2
So , the slope of the line is m = 1/2
To find the equation of line
y - y₁ = m ( x - x₁ )
Substituting the values , we get
y - 0 = 1/2 ( x - 2 )
y = x/2 - 1
So , the equation of line is y = x/2 - 1
Now , when the input is 0 , the value of x = 0
So , the output will be
y = x/2 - 1
y = 0 - 1
y = -1
Hence , the output of the function is -1 when the input is 0
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Please explain this question and the answer.
Answer:
-0.5
Step-by-step explanation:
To find the middle of two numbers you can add them together then divide by two. Here you would do -7 + 6 which equals -1
The divide by 2 which equals -0.5
What is the output of the function when the input is −3?
The output of the function when input is -3 is 3.
How to find the output of a function?A function relates each element of a set with exactly one element of another set (possibly the same set).
In a simpler term function relates input and output.
The inputs or the independent variables are on the x axis while the output or dependent variable of a function is on the y-axis.
Therefore, let's trace the y output value for an input value of -3.
Therefore, the output function when input is -3 is 3.
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graph
f(x) = x^2 + 3
The graph of the function is given in attachment.
What is Graph?Graph is a mathematical representation of a network and it describes the relationship between lines and points.
The given function is f(x) = x² + 3
f of x equal to x square plus three
f(x) = x² + 3
y= x² + 3
Select a few x values, and plug them into the equation to find the corresponding y values.
x 0 1 2 3 4
y 3 4 7 12 19
Hence, the graph of the function is given in attachment.
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What is an example of a complex fraction?.
Examples of complex fraction are [tex]\frac{\frac{1}{4}}{\frac{3}{8}}[/tex], [tex]\frac{\frac{1}{3}}{9}[/tex], [tex]\frac{4}{\frac{2}{5}}[/tex] etc.
The first and most common way to represent a fraction is with [tex]\frac{a}{b}[/tex]
Where 'a' is the numerator and 'b' is the denominator.. A horizontal bar separates the numerator and denominator.
A complex fraction is one that contains fractions in the numerator, denominator, or both.
some examples of complex fractions are:
[tex]\frac{\frac{1}{4}}{\frac{3}{8}}[/tex] , [tex]\frac{\frac{1}{3}}{9}[/tex] , [tex]\frac{4}{\frac{2}{5}}[/tex] etc.
Thus, an example of complex fraction is [tex]\frac{4}{\frac{2}{5}}[/tex].
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Hiroshi spends 30 minutes on history homework, 60 minutes on English homework, and x minutes on math homework. One fourth of his total homework time is spent on math. Which equation can be used to find the amount of time Hiroshi spends on his math homework?
1/4(x + 30 + 60) = x
The equation which can be used to find the amount of time Hiroshi spends on his math homework is 1/4(x + 30 + 60) = x
According to the question,
Let total time Hiroshi spent on his homework be "y"
Total time spent on history homework = 30 minutes
Total time spent on English homework = 60 minutes
It is given that the time spent on math homework is x
and Also that One fourth of his total homework time is spent on math
=> x = 1/4y
=> 4x = y ----------(1)
Also , Sum of time taken in different homework will be equal total time y
=> 30 + 60 + x = y --------(2)
Substituting the values of x from equation (1) in equation (2)
=> 30 + 60 + x = 4x
divide by 4
=> 1/4(x + 30 + 60) = x is equation
=> x + 30 + 60 = 4x
=> 3x = 90
=> x = 90/3
=> x = 30 minutes
Total time taken in doing homework is 120 minutes
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What is the mean of this set of data if the outlier is removed?
Thank you for helping.
Answer:
4.65[tex]m^{2}[/tex]
Step-by-step explanation:
the outlier is 28.4
add up all the numbers
3.7+5.2+3.8+5.5+4.2+5.5 = 27.9
divide by 6 (because there are 6 numbers)
27.9/6=4.65
7. Given that ABC~DEF, solve for x and y. (Fractions if the answer is a repeating or non-terminating decimal.)
Answer:
x= [tex]5\frac{1}{7} or \frac{36}{7}[/tex]
y=7
Step-by-step explanation:
we use comparing fractions for this since we know the bottom sides for both triangles we will use that
4/7=x/9
cross multiply
4(9)=7x
36=7x
/7. /7
36/7=x
5 1/7=x
now to find y we do same thing
4/7=4/y
cross multiply
4y=7(4)
4y=28
/4. /4
y=7
hopes this helps please mark brainliest
a copyright is the exclusive right to distribute, display, perform, or reproduce an original work in copies or to prepare derivative works based on the work.
The exclusive right to distribute, exhibit, perform, or reproduce an original work in copies, as well as the right to create derivative works based on the original work, is known as copyright. This assertion is true.
A bundle of legal privileges known as copyrights automatically belongs to everyone who produces an original work of authorship, such as a piece of literature, film, music, or software. These privileges include the ability to copy, create derivative works from, distribute, perform, and show the work in public.
The following exclusive rights belong to copyright owners exclusively, according American copyright law: Create phonorecords or duplicates of the material. Make works based on the original work. distribute copies or phonorecords of the work to the public by selling, transferring ownership, leasing, renting, or borrowing.
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If the probability that a person has blood type O+ is 0.35 and you have 40 randomly selectedpeople, about how many would you expect to have blood type O+? What is the standard deviationof the number of people who would have blood type O+ among the 40 people?
(a) The number of people expected to have blood type O+ among 40 randomly selected people is 14 .
(b) the standard deviation of number of people who have blood type O+ among 40 people is 3.0166 .
In the question ,
it is given that ,
probability that the person has blood group of type O+ is (p) = 0.35
the number of people randomly selected is (n) = 40 people ,
So , Number of people expected to have blood type O+ among 40 randomly selected people = Mean of the binomial distribution .
= n × p
= 40 × 0.35
= 14
So ,The standard deviation of the number of people expected to have blood type O+ among 40 randomly selected people = √(n × p × q)
= √(40 × 0.35 × (1-0.35))
= √(40 × 0.35 × 0.65)
= 3.0166
Therefore , (a) The number of people expected to have blood type O+ among 40 randomly selected people is 14 .
(b) the standard deviation of number of people who have blood type O+ among 40 people is 3.0166 .
The given question is incomplete , the complete question is
If the probability that a person has blood type O+ is 0.35 and you have 40 randomly selected people ,
(a) About how many would you expect to have blood type O+ ?
(b) What is the standard deviation of the number of people who would have blood type O+ among the 40 people ?
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You are at a restaurant and your bill comes to $29.38. You need to add the sales tax which is 6% and a tip of 20%. You have one $20 bill, two $10 bills, one $5 bill, five $1 bills, and five pennies. How much is your total bill including tax? How much should you give the server so you do not get back any pennies? Make sure you show all your work.
Answer: The amount of money needed to be given to the server is $30 and 23 cents.
Since tax is 6%, hence:
Total bill including tax = $28.52 + 6% of $28.52 = $30.23
The amount of money needed to be given to the server is $30 and 23 cents.
Therefore the denominations needed for this is one $20 bill, two $10 bills and 23 pennies.
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Step-by-step explanation:
7) Solve using a proportion. Round to the nearest tenth.
A machine bearing weighs just 1 kilogram. If 7 bearings weigh 15.4 pounds, how many pounds
would 12 bearings weigh?
The number of pounds would 12 bearings weigh are 26.39615 pounds.
What is meant by ratio?A ratio in mathematics represents the number of times one number contains another. For instance, if a dish of fruit contains eight oranges and six lemons, the orange-to-lemon ratio is eight to six (that is, 8:6, which is equivalent to the ratio 4:3). Similarly, the lemon-to-orange ratio is 6:8 (or 3:4), while the orange-to-fruit ratio is 8:14. (or 4:7).
Ratios are mathematical expressions that compare two numbers by dividing them. If you want to compare one data point (A) to another (B), your formula is A/B.
Machine Weigh
1 ---------------> 1 kg=2.20462 pounds
7 ----------------> 15.4 pounds
12 ----------------> ?
If 6 machine -------- 13.19538
5 machine ------- ?
x=(5×13.19538)/6
x=10.00615
∴ 12 machines bearings=15.4+10.99615pounds
=26.39615 pounds
The number of pounds would 12 bearings weigh are 26.39615 pounds
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4 in has a force of 50 applied. What is the pressure?
If 4 in has a force of 50 applied. The pressure is 12.5N/m².
How to find the pressure?Using this formula to find the pressure
Pressure = Force /Area
Where:
Force = 50
Area =4
Let plug in the formula
Pressure = 50/4
Pressure = 12.5 N/m²
Therefore the pressure is 12.5 N/m².
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What is a group of cubicles called?.
A cubicle-filled office may also be referred to as a "sea of cubicles," "cube farm," or "pods" such as a 4-pod or 8-pod of cubes.
In the given question we have to explain about a group of cubicles.
A cubicle-filled office may also be referred to as a "sea of cubicles," "cube farm," or "pods" such as a 4-pod or 8-pod of cubes.
A cubicle is a type of office workspace that is partially enclosed and divided from adjacent workspaces by partitions that are typically 5 to 6 feet (1.5 to 1.8 metres) tall. Its objective is to shield managers and office workers from the sights and sounds of an open workspace so they can focus with fewer interruptions. Walls, work areas, compartments, cabinets, and bookcases are just a few of the modular components that make up cubicles, which can be arranged anyway the user sees fit.
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use the point on the line and the slope of the line to find three additional points that the line passes through. (there is more than one correct answer.) point slope (-7, -7) m
The required three additional points that the line have slope (-7, -7) and m=2 passes through are (0,7), (2,11) and (1,9).
What is a line?A line has length but no width, making it a one-dimensional figure. A line is made up of a collection of points that can be stretched indefinitely in opposing directions. Two points in a two-dimensional plane determine it. Collinear points are two points that are located on the same line.
What is slope with example?The slope-intercept form of an equation is used whenever the equation of a line is expressed in the form y = mx + b. M represents the line's slope. B is the b in the location where the y-intercept is located (0, b). For instance, the slope and y-intercept of the equation y = 3x - 7 are 3 and 0, respectively.
we are given with the point (-7,-7) and m = 2(which is not given in this question so this question is incomplete)
now
first construct a linear equation using point(-7,-7) and m=2
(y−y1)=m(x−x1)
and we have
x1=-7, y1=-7
(y+7)=2(x+7)
(y+7)=2x+14
y=2x+7
Now, we can substitute values for x and y to find 3 additional points that lie on this line.
and after drawing graph we'll get the points:
(0,7), (2,11) and (1,9)
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what fraction is greater than 3/4 5/8 10/12 7/16 10/20
The fraction that is greater than 3/4 is B. 10/12
How to calculate the value?It should be noted that a fraction has a numerator and denominator and is expressed as a/b..
It should be noted that 5/8 in percentage will be:
= 5/8 × 100
= 62.5%
10/12 will be:
= 10/12 × 100
= 83.3%
7/16 will be:
= 7/16 × 100
= 700/16
= 43.75%
Therefore, the fraction greater is 10/12.
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FILL IN THE BLANK. A gate has a standard key pad with the digits 0 through 9. How many possible code combinations are there if the code is 4 digits long.
There are____ different code combinations.
A gate has a standard key pad with the digits 0 through 9. How many possible code combinations are there if the code is 4 digits long.
There are 10,000 different code combinations.
We have given that,
A gate has standard key pad with digits 0-9 ..
we have to make a 4 digit code with 10 possible digits (0-9) and first one cannot be zero .
but digits can't be repeat.
put down 5 blank spaces on paper and then put the number of combinations in each space.
the first digit can not be 0, so there are 9 possible combinations (1-9).
The second digit cannot be the same as the first digit, but it can be 0, so there are 9 combinations.
The third digit cannot be either the first or the second digit and thus there are 8 combinations.
The fourth digit has 7 combinations.
numbers of combinations you should have
9×9×8×7 = 4536
hence, total possible combination are 4536.
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In quadrilateral ABCD, AD is congruent to BC, and AD is parallel to BC. Andre has written a
proof to show that ABCD is a parallelogram. Fill in the blanks to complete the proof.
Answer:
AD is Congruent to BC and it's given, (given just means that it was already said or stated, and you don't need to do the work to find it) Angle DAC would be congruent to angle BAC (if that doesn't work, rearrange them to look like angle CAB). AC would be congruent to DB. Triangle ADC would be congruent to triangle BCD by (since i don't know exactly which way the letters are arranged is would either be SAS or SSA) and that's because you know two of the sides are congruent to each other and one angle.
I tried hard to sketch out what the shape looked like based on the information given, and that's because I need a visual of what the shape looks like. Sorry, this took so long to answer.
The blanks are filled in below and completed the proof.
What is a parallelogram?A parallelogram is a quadrilateral that has two pairs of parallel sides.
In a parallelogram, opposite sides and angles are equal.
The adjacent angles add up to 180 degrees.
We have,
AD is congruent to BC.
AD is parallel to BC.
Now,
Since AD is parallel to BC, alternate interior angles AD and BC are congruent.
AC is congruent to AC since segments are congruent to themselves.
Along with the given information that AD is congruent to BC, triangle ADC is congruent to triangle CBA by the Side-Angle-Side Triangle Congruence theorem.
Since the triangles are congruent, all pairs of corresponding angles are congruent, so angle DCA is congruent to angle BAC.
Since those alternate interior angles are congruent. AB must be parallel to CD.
Since we define a parallelogram as a quadrilateral with both pairs of opposite sides parallel, ABCD is a parallelogram.
Thus,
The blanks are filled in above.
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Lois and Alexander bought petrol from different petrol stations. a) Was Lois's petrol or Alexander's petrol better value for money? b) How much would 30 litres of petrol cost from the cheaper petrol station? Give your answer in pounds (£). Lois £17.40 for 12 litres of petrol Alexander £22.80 for 19 litres of petrol
Alexander's petrol better value for money and 30 litres of petrol cost from the cheaper petrol station is £36.
Given:
Lois £17.40 for 12 litres of petrol Alexander £22.80 for 19 litres of petrol.
a)
Lios money for 1 liter is:
= 17.40/12
= 1740/100/12
= 1740*1/100*12
= £1.45
Alexander money for 1 liter is:
= 22.80/19
= £1.2
From this alexander petrol better value for money.
b)
= 30 liters*alexander petrol cost for 1 liter
= 30*1.2
= £36.
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3 less than the product of a number g and 49?
Answer:
The equation for this is:
n(g) + 49 - 3
Step-by-step explanation:
The term "Product" means "multiplication." And "number" can be reduced to the term "n," like "g" is. The word "and" means "addition." And, "3 less" means - 3:
n(g) + 49 - 3
May I have Brainliest please? My next rank will be the highest one: A GENIUS! Please help me on this journey to become top of the ranks! I only need 10 more brainliest to become a genius! I would really appreciate it, and it would make my day! Thank you so much, and have a wonderful rest of your day!
Answer:
49g -3
Step-by-step explanation:
3 less than the product of a number g and 49
Writing an algebraic expression
less than means it comes after
the product of a number g and 49
49g
3 less than
49g -3
What are the 7 main symptoms of an allergic reaction?.
Symptoms of an allergic reactions:
Sneezing and itchy, stuffy or runny nose(allergic rhinitis)Itchy skinSkin rashes HivesCoughShortness of breathHeadache , Nausea and vomitingAllergies cause your body to react to normally harmless things like pollen, dust, and animal dander. Symptoms can be mild, but can be very serious for some people.
allergen he can enter the body in four different ways.
Respiratory - Respiration of allergensSkin - Contact with allergensGastrointestinal - Ingestion of allergensCirculatory - Allergens enter the bloodstream.Allergy symptoms vary from person to person, and the substances that trigger the allergic reaction may also be different.
Runny or Congested NoseIf you have a runny or stuffy nose after a few minutes of walking, you may have allergic rhinitis. This is our reaction to tiny particles in the air we breathe.
SneezingSneezing doesn't seem to be a big deal. However, it can be a mild early sign of a serious allergy, even the foods you eat.Your sneezing can also be quickly replaced by more serious symptoms.
Itchy, Watery EyesOccasional itchy or watery eyes can occur for many reasons. But it could be something more serious, like a drug allergy.
Breathing ChangesStrange changes can be signs of a severe allergic reaction to food or drugs. You may notice sudden wheezing. Or you just feel like you can't breathe.
Skin RashRash may be itchy, painful, warm, bumpy, or blistered. They are a common result of allergic reactions to pet dander, chemicals, foods, drugs, or cosmetics.
Blood pressureA sudden drop in blood pressure can make you feel like you're going to pass out. The whole body may become weak or confused. this is a serious situation.
Swollen body parts like Tongue or LipsIf your mouth, lips, or tongue are swollen for no apparent reason, this may be angioedema, a sign of an allergic reaction. It's not necessarily serious.
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what is the answer?
Step-by-step explanation:
1)
to finish the work in 30 days, 9 workers are needed.
that means one worker can do 1/9 of the work in 30 days, and therefore 1/9 / 30 = 1/270 of the work in one day.
that means we need 270 workdays to finish the work.
to get the work done in 18 days we need therefore
270/18 = 15 workers
2)
you mention only 3 things (emergency, Tracey insurance and mutual fund) but the ratio covers 4.
what is missing ?
without that information this cannot be solved.
but this is what you do, when you find the 4th thing :
the ratio 9 : 5 : 4 : 7 tells us that the whole (P5000) is split into 9+5+4+7 = 25 parts.
each part is therefore worth 5000/25 = P200.
so, whatever is represented by 9 parts gets 9×200 = P1800.
whatever is represented by 5 parts gets 5×200 = P1000.
whatever is represented by 4 parts gets 4×200 = P800.
and whatever is represented by 7 parts gets 7×200 = P1400.
select the correct answer. the parent tangent function is horizontally compressed by a factor of and reflected over the x-axis. which equation could represent function g, the result of this transformation? a. b. c. d.
The equation that represents the function g , the result of the transformation is g(x) = -(1/2)tanx .
In the question ,
the parent function is given to be tangent ,
let the the parent function be denoted by "f" ,
So , f(x) = tanx,
given that the function is horizontally compressed by a factor of 1/2 ,
that means the function is multiplied by 1/2 ,
So ,g(x) = (1/2)tanx
also given that it is reflected over the x axis ,
reflection over x axis means , multiplying it by -1,
So , g(x) = -(1/2)tanx .
Therefore , the function g is g(x) = -(1/2)tanx .
The given question is incomplete , the complete question is
The parent tangent function is horizontally compressed by a factor of 1/2 and reflected over the x-axis. Write an equation to represent function g, the result of this transformation ?
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Answer:
g(x)=-tan(2x)
Step-by-step explanation:
What is the area of the rectangle?
A. 60 units
B. 66 units
C. 70 units
D. 74 units
The area of the Rectangle is 70 units², So option (C) is the correct answer.
Let,
Length of Rectangle = 10 units
Width of Rectangle = 7 units
Area of rectangle = length × Width
Putting the Length and Width of the rectangle in the last equation.
So,
Area of rectangle = 10 × 7 units²
Area of rectangle = 70 units²
Hence, The area of the rectangle is 70 units².
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How do you find the cubic polynomial if sum of the zeros and product of the zeros is given?.
The cubic polynomial can be computed using the following formula if the zeros of a cubic polynomial's product and sum are known: (x - sum of zeros) (x² + product of zeros) is a cubic polynomial.
A three-degree polynomial is referred to as a cubic polynomial. The cubic polynomial can be computed using the following formula if the zeros of a cubic polynomial's product and sum are known:
cubic function = (x - sum of zeros)
(x² + zero product)
For instance, the cubic polynomial is (x + 1)(x2 - 4) if the product of the zeros is 4 and the total of the zeros is -1.
The cubic polynomial is illustrative of:
ax³ + bx² + cx + d = 0
In the general case, where a, b, c, and d are constants.
The product of the zeros is given by: d/a ,
The zeros' sum is given by : - b/a.
These numbers are substituted into the cubic polynomial's general equation to produce the following result:
ax³ + bx² + cx + d = a(x³ + (-b/a)x² + (d/a)x)
= a(x³ - bx + d)
Therefore, if the product and sum of the zeros are known, the cubic polynomial may be obtained.
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-4(y+3)+35>4(6-y) please find the answer to this. It can also be ARN or No solution
Step-by-step explanation:
just like with every equation. we move things around by applying the same operations to both sides.
-4(y + 3) + 35 > 4(6 - y)
-4y - 12 + 35 > 24 - 4y
23 > 24
that is always false (23 is never larger than 24).
so, there is no solution.
What 3 things should be done to properly maintain the AED and its supplies?.
To maintain AED and its supplies;-
Check the AED's power by turning it on and ensuring it does so without any issues.Verify that the AED has the additional rescue items, such as gloves, a razor, and a breathing mask.Look for cracks, wear, and other signs of deterioration on the actual gadget.Given,
AED;-
When a person is having a sudden cardiac arrest, an AED, or automated external defibrillator, is used to assist them. It is an advanced but simple to use medical equipment that can analyze the heart's rhythm and, if necessary, provide an electrical shock, or defibrillation, to aid in the heart's re-establishment of an efficient rhythm.
Here,
To maintain AED and its supplies;-
Check the AED's power by turning it on and ensuring it does so without any issues.Verify that the AED has the additional rescue items, such as gloves, a razor, and a breathing mask.Look for cracks, wear, and other signs of deterioration on the actual gadget.Learn more about AED here;
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Which graph represents the function f x equals four over X?.
Answer:
You can see the graph in the picture attached.
given a two-dimensional array x of doubles , write an expression whose value is twice the value of the element in the 3rd row and the 2nd column.
The expression whose value is twice the value of the element in the 3rd row and the 2nd column will be x [2][1] × 2
Given,
In the question:
A two-dimensional array x of doubles
Write an expression whose value is twice the value of the element in the 3rd row and the 2nd column.
Now, According to the question:
A two-dimensional array x of doubles
The value of the element in the 3rd row and the 2nd column.
Also, Value is twice of an element.
The expression will be :
=> x [2][1] × 2
Hence, The expression whose value is twice the value of the element in the 3rd row and the 2nd column will be x [2][1] × 2
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what is the probability that after a fair coin is tossed 5 times that the result will contain 3 'heads' given that the first toss was a 'head' ?
Using Conditional probability,
The probability that after a fair coin is tossed 5 times that the result will contain 3 'heads' given that the first toss was a 'head' is 3/5.
A fair coin is tossed five times .
so, total possible outcomes = 2⁵ = 32
Let A: head observed on first toss
B: 3 heads observed.
Probability that the first toss was head (p) = 1/2
we have to find out probability that on 5 tosses result contain 3 heads given that first toss wss head .
Using Binomial Probability distribution
P (X= x) = ⁿCₓ (p)ˣ (q)⁽ⁿ⁻ˣ⁾
x = 3 , n = 5
we get , P(B) = P(X= 3 ) = ⁵C₃(1/2)³(1/2)²
=> P(B) = 10 ×(1/2)⁵= 5/16
since the first toss is fixed as a head.
P(A ∩ B) =P( X₁ = 1 and X₂+ X₃ + X₄ + X₅) = P(X₁= 1)P(X₂+X₃+X₄+X₅)
= 1/2 × ⁴C₂ (1/2)⁵ = 3 (1/2)⁴
The required probability is , Conditional probability P(B/A) = P(A ∩ B)/P(A)
= 3(1/2)⁴/ 5/16 = 3/5
Hence , the required probability is 3/5.
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given a non-negative integer numrows, generate the first numrows of pascal's triangle. in pascal's triangle, each number is the sum of the two numbers directly above it
For the non negative number, the first number of rows of pascal's triangle is attached below.
Non negative number:
Non negative number means the number which is either zero or a positive number.
Given,
Here we have a non-negative integer number of rows, And we have to generate the first number of rows of pascal's triangle And in pascal's triangle, each number is the sum of the two numbers directly above it.
Before make the pascal's triangle,
We know that the given condition is each number is the sum of the two numbers directly above it.
Based on these condition, we have plotted the following pascal's triangle.
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