Prove that the angle between any two diagonals of a cube is given by cos=1/3
Answers
Consider a cube of side a units, with sides along x, y and z axis and one vertex at origin, as in the figure.
Here AB and CD are two diagonals of the cube, because A and B are diagonally opposite corners, also C and D.
In the figure, coordinates of A is (0, 0, 0) and that of B is (a, a, a). Then vector AB is given by,
[tex]\vec{\rm{AB}}=\rm{\left < a,\ a,\ a\right > }[/tex]
Coordinates of C is (a, 0, 0) and that of D is (0, a, a). Then vector CD is given by,
[tex]\vec{\rm{CD}}=\rm{\left < -a,\ a,\ a\right > }[/tex]
The diagonals each have a magnitude of a√3.
[tex]|\vec{\rm{AB}}|=|\vec{\rm{CD}}|=\rm{a\sqrt3}[/tex]
In the figure θ is the angle between the diagonals.
We take the dot product of the vectors AB and CD to get angle between them.
[tex]\longrightarrow\vec{\rm{AB}}\cdot\vec{\rm{CD}}=|\vec{\rm{AB}}|\cdot|\vec{\rm{CD}}|\cdot\cos\theta[/tex]
[tex]\longrightarrow\rm{\left < a,\ a,\ a\right > \cdot\left < -a,\ a,\ a\right > =a\sqrt3\cdot a\sqrt3\cdot \cos\theta}[/tex]
[tex]\longrightarrow\rm{-a^2+a^2+a^2=3a^2\cos\theta}[/tex]
[tex]\longrightarrow\rm{a^2=3a^2\cos\theta}[/tex]
[tex]\longrightarrow\rm{\cos\theta=\dfrac{a^2}{3a^2}}[/tex]
[tex]\longrightarrow\rm{\underline{\underline{\cos\theta=\dfrac{1}{3}}}}[/tex]
The angle between the diagonals satisfy this equation.
Hence Proved!
Related Questions
Given UV, VW and UW are midsegments, if TS
=42, UW=23, and VW=19.
R
RT.
U
T
V
choose your answer...
W
S
Vis the length of
HELP ASAP PLEASE!!!!!!!!!
Answers
The required length of the RT is given as 38 units, in the triangle.
What is the triangle?The triangle is a geometric shape that includes 3 sides and the sum of the interior angle should not be greater than 180°
here,
Given figure show is of the triangle where UV, VW, and UW are midsegments,
The property of triangles states that,
The length of the side is half of the line joining the midpoints of the adjacent of the triangle.
2VW = RT
RT = 2[19]
RT = 38
Thus, In the triangle, the required length of the RT is stated as 38 units.
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Determine the range of the following graph:
Answers
Step-by-step explanation:
the domain of a function is the interval or set of all valid x (input) values.
the range of a function is the interval or set of all valid y (function result) values.
we see in the graph that we get for y all continuous values between 0 (max) and -9 (min).
both end points are filled, so we need to include them into the interval of valid values (via the <= or >= signs).
so the range is
-9 <= y <= 0
What will be the nature of the roots of the equation 2x² 4x 7 0?
Answers
The roots of the quadratic equation are real and distinct
What is Quadratic Equation?
A quadratic equation is a second-order polynomial equation in a single variable x , ax² + bx + c=0. with a ≠ 0. Because it is a second-order polynomial equation, the fundamental theorem of algebra guarantees that it has at least one solution. The solution may be real or complex.
The roots of the quadratic equations are
x = [ -b ± √ ( b² - 4ac ) ] / ( 2a )
where ( b² - 4ac ) is the discriminant
when ( b² - 4ac ) is positive, we get two real solutions
when discriminant is zero we get just one real solution (both answers are the same)
when discriminant is negative we get a pair of complex solutions
Given data ,
Let the quadratic equation be represented as A
Now , the value of A is
2x² + 4x - 7 = 0 be equation (1)
On simplifying the equation , we get
The roots of the quadratic equations are
x = [ -b ± √ ( b² - 4ac ) ] / ( 2a )
Substituting the values in the equation , we get
x = [ -4 ± √ ( ( 4 )² - 4 ( 2 ) ( -7 ) ) ] / 2 ( 2 )
On simplifying the equation , we get
x = [ -4 ± √ ( 16 + 56 ) ] / 4
x = [ -4 ± 6√2 ] / 4
x = ( -2 + 3√2 ) / 2
And ,
x = ( -2 + 3 ) / √2
Therefore , the roots are x = ( -2 + 3√2 ) / 2 and x = ( -2 + 3 ) / √2
Hence , the roots of the equations are real and distinct
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What is the product of three consecutive odd numbers?
Answers
The product of three consecutive odd numbers is an odd number.
An odd number is a number that is not divisible by 2, therefore also can not be divided exactly into pairs. Numbers that are deemed odd number end with the number 1, 3, 5, 7, or 9. When divided by 2, odd numbers leave a remainder of 1.
When three consecutive odd numbers are multiplied, the end product would be another odd number. For example:
3 x 5 x 7 = 105 (ends in 5, which means it's an odd number)27 x 29 x 31 = 24,273 (ends in 3, which means it's an odd number)101 x 103 x 105 = 1,092,315 (ends in 5, which means it's an odd number)Learn more about odd numbers at https://brainly.com/question/2263958
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Anybody know the answer?
Answers
The best finish of the construction of TU :
Set the compass at length RS. Then place point U on the lower segment at a distance RS from Point T.
What is a Line Segment?
A line segment is a line with a fixed endpoint.
It has a definite length.
We have to construct TU a copy of RS using a compass and a straightedge.
Construction of TU:
Set the compass at length RS. Then place point U on the lower segment at a distance RS from Point T.
Hence, the best finish of the construction of TU :
Set the compass at length RS. Then place point U on the lower segment at a distance RS from Point T.
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How many terms are there in the expression 3xy?
Answers
Answer:
ur mom
Step-by-step explanation:
haha lol;)
The tree diagram represents an
experiment consisting of two trials.
P(A and C) = [ ? ]
Answers
Answer:
0.2
Step-by-step explanation:
0.5*0.4=0.2
Consider two vectors A and B, expressed in unit vector notation as A = a1i + a2j and B = b1i + b2j. Part (a) Enter an expression for the vector sum A + B in terms of quantities shown in the expressions above.Expression :A+B = __________________________________________Select from the variables below to write your expression. Note that all variables may not be required.α, β, θ, i, j, k, a1, a2, b1, b2, d, g, h, m, tPart (b) Enter an expression for the difference vector A - B in terms of quantities shown in the expressions above.Expression :A-B = __________________________________________Select from the variables below to write your expression. Note that all variables may not be required.α, β, θ, i, j, k, a1, a2, b1, b2, d, g, h, m, t
Answers
(a) The vector sum A+B = (a(1)+b(1))i + (a(2)+b(2))j.
(b) The difference vector A-B = (a(1)-b(1))i + (a(2)-b(2))j.
(c) The square of the magnitude of the sum vector |A + B| = (a(1)+b(1))^2 + (a(2)+b(2))^2.
In the given question, two vectors A and B, expressed in unit vector notation as A = a(1)i+a(2)j and B = b(1)i+b(2)j.
A = a(1)i+a(2)j
B = b(1)i+b(2)j
(a) We have to find the vector sum A + B.
A+B = (a(1)i+a(2)j) + (b(1)i+b(2)j)
A+B = a(1)i+a(2)j + b(1)i+b(2)j
A+B = (a(1)+b(1))i + (a(2)+b(2))j
(b) We have to find the difference vector A - B.
A-B = (a(1)i+a(2)j) - (b(1)i+b(2)j)
A-B = a(1)i+a(2)j - b(1)i-b(2)j
A-B = (a(1)-b(1))i + (a(2)-b(2))j
(c) We have to find the square of the magnitude of the sum vector |A + B|.
|A + B| = [√{(a(1)+b(1))^2 + (a(2)+b(2))^2}]^2
|A + B| = (a(1)+b(1))^2 + (a(2)+b(2))^2
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The right question is:
Consider two vectors A and B, expressed in unit vector notation as A = ai+aj and B = bi+byj.
33% Part (a) Enter an expression for the vector sum A + B in terms of quantities shown in the expressions above A+B.
33% Part (b) Enter an expression for the difference vector A-B in terms of quantities shown in the expressions
33% Part (c) Enter an expression for the square of the magnitude of the sum vector |A + B| in terms of quantity above.
5 stars 30 points and a thanks.
How many elves are helping Santa?
There are a total of 58 reindeer and elves helping Santa get ready for Christmas. Each reindeer has 4 legs and each elf has 2 legs. Frosty the Snowman, who doesn’t have any legs, counted 158 legs when all the reindeer and elves were in Santa’s workshop helping Santa. How many elves are helping Santa? Enter your answer as a number only
Answers
There are 37 elves are helping Santa by solving both the equations x + y=58 and 4x+2y=158 the concept of equations.
What is equation?Equations are mathematical expressions that have two algebraic expressions on either side of an equals (=) sign. This relationship is illustrated by the left and right expressions being equal to one another. L.H.S = R.H.S is the first term in every mathematical equation.
According to the question we assume the number of reindeer are x and number of elves are y.
Total 37 elves are helping Santa. There are a total of 58 reindeer and elves helping Santa get ready for Christmas hence the equation of given condition is as follows:
x + y=58
Each reindeer has 4 legs and each elf has 2 legs counted 158 legs when all the reindeer and elves were in Santa’s workshop helping Santa. Hence the equation of given condition is as follows:
4x+2y=158
By solving both the above equation multiplying first equation by 2
2x+2y=116
Subtract both the above equation
2x=42
x=21
Hence the number of reindeer are x=21
Inserting value of x in first equation gives y=37
The number of elves is y=37
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Let f be the function given by f (x) = e + cos x - 1. What is the value of
f' (2) ?
Answers
Let f be the function given by f (x) = e + cos x - 1. the value of f' (2) is 0.0349
How to find f' (2)The given function is f (x) = e + cos x - 1,
f' is the derivative of the given function, and the derivative is sort for below
f (x) = e + cos x - 1
f' (x) = 0 + -sin x - 0
f' (x) = -sin x
for f' (2) we substitute the x = 2 in the derivative
f' (x) = -sin x
f' (2) = -sin 2
f' (2) = -sin 2
f' (2) = -0.0349
hence f' (2) = -0.0349
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Line r passes through the points (1,1) and (8,9) . line s is perpendicular to r what is the slope of line s?
Answers
Answer: [tex]\frac{-7}{8}[/tex]
Step-by-step explanation:
First, we will need to find the slope of line r.
[tex]\displaystyle \frac{y_{2} -y_{1} }{x_{2} -x_{1}} =\frac{9-1}{8-1}=\frac{8}{7}[/tex]
Next, we know that perpendicular slopes are negative reciprocals of one another. To find the slope of line s, we will find the negative reciprocal of line r's slope.
[tex]\displaystyle \frac{8}{7} \rightarrow \frac{-7}{8}[/tex]
How do you prove that an equilateral triangle has equal angles?
Answers
So in the traingle PQR shown in the figure below PQ,QR,PR is the side of the traingle .
we have to prove that ∠QPR = ∠PQR = ∠ PRQ.
According to the definition of equilateral triangle all sides length of equilateral traingle are equal.
so PQ=QR=PR
Statement 1:
Angles opposite to equal sides QR and PR are equal so .
=> ∠QPR = ∠PQR
Statement 2:
Angles opposite to equal sides PR and PQ are equal so .
=> ∠PQR = ∠ PRQ.
combining statement 1 and statement 2.
=> ∠QPR = ∠PQR = ∠ PRQ and hence all three angles are same [Proved]
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Matthew made a fruit salad, in which the ratio of blueberries to red grapes is 8:6. Write the ratio of red grapes to blueberries in simplest form. [Type your ratio using a colon and without spaces.]
Answers
The ratio of red grapes to blueberries in simplest form is 3/4.
What is ratio?
A ratio in mathematics demonstrates how many times one number is present in another. For instance, if a bowl of fruit contains eight oranges and six lemons, the ratio of oranges to lemons is eight to six. The ratio of oranges to the total amount of fruit is 8:14, and the ratio of lemons to oranges is 6:8.
Given:
Matthew made a fruit salad, in which the ratio of blueberries to red grapes is 8:6.
We have to find the ratio of red grapes to blueberries in simplest form.
Let there are 6 red grapes and 8 blueberries.
So, the ratio is
Red grapes / blueberries = 6/ 8
Reduces the ratio,
6 / 8 = (2 x 3) / (2 x 4) = 3 /4
Hence, the ratio of red grapes to blueberries in simplest form is 3/4.
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Is 54 a multiple of 9?
Answers
Answer:
Yes
Step-by-step explanation:
We want to find the multiples of 9
9*1 = 9
9*2 = 18
9*3 = 27
9*4 = 36
9*5 = 45
9*6 =54
Since 9*6 = 54
54 is a multiple of 9
Answer with step-by-step explanation:
Divide 54 by 9.You'll get 6 and as it is a whole number 54 can be considered as a multiple of 9.OR
Look into the multiples of 9.1 × 9 = 92 × 9 = 183 × 9 = 274 × 9 = 365 × 9 = 456 × 9 = 54Accordingly, 9 into 6 equals 54. That is, 54 is a multiple of 9.How many fair dice are there?
Answers
Answer:
Fair Dice. In mathematics we say "fair dice" when we mean that there is an equally likely chance of landing on any face. Most people think of these little cubes. when we say "dice" ... ... but all of the Platonic Solids can make fair dice! Because the faces are all the same, there is an equal chance of landing on any face.
Step-by-step explanation:
What are the 4 types of transformations examples?
Answers
The four types of Transformations - Rotation, Translation, Reflection, Dilation.
What is transformation ?A point, line, or geometric figure can be transformed in one of four ways, each of which affects the shape and/or location of the object. Pre-Image refers to the object's initial shape, and Image, after transformation, refers to the object's ultimate shape and location.
When we relocate a picture without making any other changes to it, we say that we have translated it.Rotation is the process of slightly rotating a picture.When we flip an image along a line (the mirror line), it is called reflection.Dilation is the process of enlarging or contracting an image's size without altering its form.Transformations may be divided into four categories: translation, rotation, reflection, and expansion. You must be able to carry out each change and recognize which ones have already been done.
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Translation, rotation, reflection, and dilation are the four basic forms of transformations.
What is Transformation?By rotating, reflecting, or translating a shape on a coordinate plane, a transformation is made. A fresh viewpoint on geometry known as transformational geometry was put forth by Felix Klein in the 19th century.
The transformation is f: X X, which stands for a function, f, that maps to itself. The transformation causes the pre-image X to change into the picture X. Translation, rotation, reflection, and dilation are only a few examples of the transformations that can be used alone or in combination. A function is translated when it is moved in one direction, rotated when it is spun around a point, reflected when it is turned into the opposite of itself, and dilated when it is scaled. Two-dimensional geometrical figures can move about a coordinate plane via mathematical transformations.
Hence, Translation, rotation, reflection, and dilation are the four basic forms of transformations.
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1. Use the GRAPHING METHOD to
solve the following system of
equations. (4pts)
y = (x) - 4
5x +y = 2
Answers
Answer:
x = 6
y = 2
(6,2)
Step-by-step explanation:
Align equations with each otherRearrange to have y and x on the same sideAdd both equations to cancel out a variable (y)Solve for the remaining variable (x)Plug in x into any one of the two original equations to obtain the Y variableTHE SOLUTION WORK IS ATTACHED
What is a fair sided cube?
Answers
Answer:
A fair number cube is a cube with six sides, each containing a different number.
Step-by-step explanation:
six sidesA fair number cube is a cube with six sideseach containing a different number. What is the probability that the number cube turns up a multiple of 3? 1/3Let E be the event of getting a multiple of 3. Hence the probability of getting a multiple of 3 when a die is thrown is 1/3. Cube Numbers – Numberblocks 1 to 8000!
How is congruence related to rigid motion transformations?
Answers
An object is moved rigidly when it is transferred from one location to another without affecting its size or shape.
What is congruence?
A "matching" figure is one that can be placed perfectly on another. The bread has the same size and form when it is stacked. Match refers to objects that are precisely the same size and form. If one of two geometric figures can be consistently overlaid on the other, they are said to be congruent or to be in a congruent relationship.
When an object is transferred from one place to another without changing in size or shape, it is said to be moved rigidly. Two shapes can only match if a precise movement results in a correspondence between them.
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somebody help me out
Answers
The vertex of the parabola equation is (5, 43) and the parabola standard form is y = 2x² + 20x + 43.
What is Parabola?
A parabola refers to an equation of a curve, such that a point on the curve is equidistant from a fixed point, and a fixed-line. The fixed point is called the focus of the parabola, and the fixed line is called the directrix of the parabola.
We have,
The parabola standard from f(x) = a(x-h)² + k
f(x) = 2x² + 20x + 43
The general equation of a parabola is y = a(x - h)² + k or x = a(y - k)² +h, where (h,k) denotes the vertex.
Consider an equation y = 2x² + 20x + 43. For this parabola, a = 2 , b = 20 and c = 43. which is a parabola.
Vertex: (h, k)
h = -b/2a
= 20/(2 × 2)
= 5
k = f(h)
= f(5) = 2(5)² + 20(5) + 43
= 50 + 100 + 43
Thus vertex is (5, 43)
Hence, the vertex of the parabola equation is (5, 43) and the parabola standard form is y = 2x² + 20x + 43.
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How do you determine how many solutions a system will have?
Answers
The correct options will be:
y = x + 6 and 3x - 3y = -18 .... Infinitely many solutions.
y = -2x + 5 and 2x + y = -7 .... No solution.
y = -4x + 11 and -6x + y = 11 ... One solution.
What is meant by mathematical solution ?An assignment of values to the unknown variables that establishes the equality in the equation is a solution. In other terms, a solution is a value or set of values (one for each unknown) that, when used in place of the unknowns, transform the equation into an equality. A number that may be entered for the variable to produce a true number statement is a solution to an equation. 6+5=11 is true according to the formula 3(2)+5=11. Therefore, the answer is 2, which. Discriminant b2 - 4ac has zero value when there is just one real solution. For instance, the equation x2 + 2x + 1 = 0 only has one solution, x = -1. Using the Determinant Calculator on Cuemath, you may determine the determinant of a quadratic equation.Solving equations
y = -4x + 11 ....... equation i
-6x + y = 11 ...... equation ii
Put equation i into ii.
-6x + y = 11
-6x + (-4x + 11) = 11
-6x - 4x + 11 = 11
-6x - 4x = 11 - 11
-10x = 0
x = 0
Therefore,
x = 0 and y = 11.
This gives a solution for each variable.
y = -2x + 5 ..... i
2x + y = -7 ..... ii
Put equation i into ii
2x + y = -7
2x + (-2x + 5) = -7
2x - 2x = -7 - 5
0 = -12
This indicates no solution.
y = x + 6 ..... i
3x - 3y = -18 ..... ii
Put equation i into ii
3x - 3y = -18
3x - 3(x + 6) = -18
3x - 3x - 18 = -18
3x - 3x = - 18 + 18
0 = 0
This implies that there are infinitely many solutions.
The complete question is:
How many solutions will each system of linear equations have? Match the systems with the correct number of solutions.
y = x + 6 and 3x - 3y = -18
no solution
y = -2x + 5 and 2x + y = -7
Ano
infinitely many solutions
y = --4x + 11 and 6x + y = 11
one solution
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What is m<3 if m<2 = 26°?
Answers
Answer:
m<1+m<2+m<3=180°
90°+26°+m<3=180°
116°+m<3=180°
m<3=180°-116°
m<3=64°
m<3=64
Solve pls brainliest
Answers
Step-by-step explanation:
-6 - (-5.5) = -0.5
-5.5 - (-5) = -0.5
rate of change is 0.5. Points, if plotted, would be angled up towards the right so slope is positive.
y-intercept occurs when x = 0. From the chart this is when y = -6
Answer:
y = 0.5x - 6
What is the length of AC 3 FR?
Answers
The AC is 18 feet long.
Triangles are primarily involved in the mid-point theorem. According to this rule, if the midpoints of any two triangle sides are connected, the line formed is parallel to the third side and equal to half of the third side. Contrarily, if a parallel line is drawn from one side's midpoint to any other, it will bisect the third side and be equal to half the side to which it is parallel.
As shown in the diagram,
AM = MB, CN = NB.
The midpoints of the sides AB and CB, respectively, are M and N.
So, according to the midpoint theorem,
MN ║ AC,
The alternative interior angle theorem demonstrates that
∠BMM ≅∠BAC
∠BNM ≅∠BCA
According to the AA similarity postulate,
ΔBMM ≅∠BAC
The characteristic of identical triangles
[tex]\frac{BM}{BA} = \frac{MN}{AC}\\ \frac{BM}{BM+MA} = \frac{MN}{AC}\\ \frac{4}{4+4} = \frac{9}{AC}\\ \frac{4}{8} =\frac{9}{AC} \\[/tex]
4AC=72
AC=18 ft
As a result, AC is 18 feet long.
The complete question is:-
What is the length of the AC?
3 ft
4 ft
9 ft
18 ft
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I need help with this please!! I need this before 2!
Answers
Answer:
s=2h
Step-by-step explanation:
it takes 2 hours for 1 inch of snow so 1snow=
Is 2x² 7x 0 is quadratic equation?
Answers
2x² 7x 0 is not a quadratic equation.
What is quadratic equation?A quadratic equation is an equation of the second degree, meaning it contains at least one term that is squared. The standard form of quadratic equation is ax^2+bx+c
What are the 3 quadratic formulas?Standard Form: y = a x 2 + b x + c y=ax^2+bx+c y=ax2+bx+c.
Factored Form: y = a ( x − r 1 ) ( x − r 2 ) y=a(x-r_1)(x-r_2) y=a(x−r1)(x−r2)
Vertex Form: y = a ( x − h ) 2 + k y=a(x-h)^2+k y=a(x−h)2+k.
Comparing given equation 2x² 7x 0 with standard form of quadratic equation is , we are not able to find values of a,b,c.
Hence,2x² 7x 0 is not a quadratic equation.
2x² 7x 0 is not a quadratic equation.
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What is population function in statistics?
Answers
The group of things from which data are taken for a statistical research is referred to as a population in statistics. A data pool for study might consist of numerous things, many individuals, etc.
what is statistics?large-scale numerical data collection and analysis, especially with the aim of extrapolating proportions in the total from those in a representative sample.
The study and development of techniques for gathering, processing, interpreting, and presenting empirical data are the focus of the science of statistics. It could be a collection of things, a gathering of people, etc. It serves as the study's data set.
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How will you describe the graph of polynomial functions if the degree is even number and the leading coefficient is negative?
Answers
If the degree of the polynomial function is an even number and the leading coefficient is negative, the graph will have an even number of turning points and will be concave down. The graph will also have a single x-intercept at the origin, and the y-intercept will be negative.
A graph of polynomial functions with an even degree and negative leading coefficient will have an even number of turning points and will be concave down. A turning point is the point on a curve where the curve changes direction, and a concave down shape means that the curve is curved down from left to right. The graph will have a single x-intercept at the origin, which is the point where the graph crosses the x-axis. The y-intercept of the graph will also be negative, which is the point where the graph crosses the y-axis. This graph will have a negative slope and will decrease as it moves away from the origin. The graph will approach the x-axis but will not touch it, creating a U-shaped curve. The graph will also have a maximum or minimum value, depending on the specific values of the polynomial function.
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What’s the domain and range of this function?
Answers
The domain and range of the given quadratic function are respectively; Domain = -3 < x < 7; Range is; 3 ≤ x ≤ ∞
What is the domain and range of the function?The domain of a function is defined as the set of all possible input values for which the function is possible.
Meanwhile, the range is defined as the set of all possible output values for every possible input value that makes the function possible.
Now, from the graph, the range will be values on the y-axis while the domain will be values on the x-axis.
Now, from the given graph we see that the curve is approaching the lines x = -3 and x = 7. Thus, the domain of this function is;
Domain = -3 < x < 7
Meanwhile the range keeps increasing to positive infinity and as such we can say that;
Range is; 3 ≤ x ≤ ∞
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What are whole numbers give 5 examples?
Answers
Answer:
whole numbers are numbers including zero, positive and no fractions
Step-by-step explanation:
0, 8, 89, 98, 999999999999, 57, 3, 5