(a) for every integer z, we can find integers x and y such that f(x, y) = z, and thus f(x, y) is onto.
(b) f(x, y) = |x| - |y| is not onto.
Which of the function is onto?(a) To show that the function f(x, y) = 2x - 4y is onto, we need to show that for every integer z, there exists integers x and y such that f(x, y) = z.
Let z be an arbitrary integer. Then we need to find integers x and y such that 2x - 4y = z. We can rewrite this equation as x = (z + 4y)/2.
Now, if z is even, then we can choose any even number for y and solve for x using the above equation. Conversely, if z is odd, we can choose any odd number for y and solve for x.
Therefore, for every integer z, we can find integers x and y such that f(x, y) = z, and thus f(x, y) is onto.
(b) To show that the function f(x, y) = |x| - |y| is not onto, we need to find an integer z such that there does not exist integers x and y such that f(x, y) = z.
Let z = -1. Then we need to find integers x and y such that |x| - |y| = -1. However, the absolute value of any integer is non-negative, so |x| and |y| are both non-negative.
Therefore, |x| - |y| is non-negative, and it is impossible for f(x, y) to equal -1.
Hence, there does not exist integers x and y such that f(x, y) = -1, and thus f(x, y) is not onto.
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If you can solve any of the questions, please show steps.
The value for which f(x) is equal to 5 is c = ∛4 = 1.59, that proves the intermediate value theoerem.
How to verifiy the intermediate value theorem?
We have the function:
f(x) = x³ + 1
Evaluating this on the end values of the interval [0, 3] we will get:
f(0) = 0³ + 1 =1
f(3) = 3³ + 1 = 27 + 1 = 28
Now, the value k = 5 is between these two:
1 < 5 < 28
The intermediate value theorem says that there is a value c in [0, 3] such that f(c) = 5, so let's find the value of c.
c³ + 1 = 5
c³ = 5 - 1
c³ = 4
c = ∛4
c = 1.59
That is the value for which f(x) is equal to 5.
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find domain and range
f(x)=√3-2x
Answer:
Step-by-step explanation: f(x)=√3-2x
For all x∈R, f(x) is R;
Domain, Df=R (Real Number);
Let, y=f(x)=√3-2x;
y=√3-2x;
2x=√3-y;
x= [tex]\frac{\sqrt{3}-y }{2}[/tex];
For all y∈R, x is R;
Range, Rf=R
Sam has a greeting card business where he creates and sells hand-made greeting cards for all occassions. His current card requires a heart with the given dimensions on the front in each of the corners. Each heart is made of a circle and a square, where the diameter of the circle is the same as the length of a side of the square, 2 inches. Calculate the area of each heart for Sam's greeting card.
Answer: 7.14 in²
Step-by-step explanation:
1) Find the area of the square: 2*2 = 4 square inches
2) We can see that there are 2 semi-circles with the same diameter or 2 inches. Use the area of a circle formula: A = r².
Since the diameter is 2 inches, the radius is diameter/2 which is 1 inch.
Plug this information into the formula.
A=
= 3.14 inches
3) 4 + 3.14 = 7.14 inches²
The answer is the second option, 7.14 inches²
HELP ASAP 25 POINTS PLEASE
Answer:
The new price is $4.76
Step-by-step explanation: You multiply 3.40 x 0.4 to get 1.26, and then you add that to 3.40 to get the answer.
Have a great day!
Convert 4% into a decimal by doing 4 divided by 100 and you'll get 0.04.
Multiply 3.40 and 0.04 and you will get 0.136.
Add 0.136 to 3.40 and you'll get 3.536
That is the new price of the item after it is marked up.
4. ¿Cuál es la altura de una torre que proyecta una
sombra de 16 m, si la distancia desde el punto
más alto de la torre al extremo de la sombra es de
20 m?
Answer:
134.16 meters and length of shadow is 268.33 meters
Step-by-step explanation:
Applying Pythagoras. Let the the distance from the end of the shadow to building top be the hypotenuse side 300 meter, building height be X and the adjacent be the shadow length which is twice the height of the building 2XTherefore from Pythagoras theorem:Squared of hypotenuse side= to sum of squares of the other sidesC^2= a^2+b^2300*2= X^2+2X^290000= 5X^2X^2= 90000/5X^2=18000X= 134.16 meters2X = 268.33 metersTherefore the height of building is 134.16 meters and length of shadow is 268.33 meters
Ryan’s grandparents bought him a new basketball. Ryan wants to know if the ball is the same size as the ball his basketball league uses. The volume of the ball is 295.6 cubic inches. What is the circumference of Ryan’s new basketball? Use 3.14 for pi
.
Thus, the circumference of Ryan’s new spherical basketball is found as: 52.752 in.
Explain about the circumference:The perimeter of a polygon, including a square or rectangle, is the distance around it (P). On the opposing hand, the circumference of a circle is the distance around it (C). As a result, the circular circumference is the length of a circle's edge in linear terms.
Given data:
Volume of ball = 295.6 cubic inches.As the ball is in the shape of sphere.
Let r be the radius of sphere:
Volume of sphere = 4/3 * π * r³
295.6 = 4/3 * 3.14 * r³
r³ = (295.6 * 3)/(4*3.14)
r³ = 70.60
r = 8.40 in
circumference = 2 * π * r
circumference = 2 * 3.14 * 8.40
circumference = 52.752 in
Thus, the circumference of Ryan’s new spherical basketball is found as: 52.752 in.
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help in this exercise pleaseeeeeeeeeeee
The graph of the system is Option A.
Describe Inequality?In mathematics, an inequality is a statement that compares two values, expressing that one value is greater than, less than, or equal to the other value. An inequality is typically denoted using symbols such as "<" (less than), ">" (greater than), "<=" (less than or equal to), ">=" (greater than or equal to), or "!=" (not equal to). For example, the inequality "x > 5" states that the value of x is greater than 5.
Inequalities are used in many areas of mathematics, including algebra, calculus, and geometry. They are also used in real-world applications such as economics, physics, and engineering to represent constraints on variables or parameters.
An inequality can be represented graphically as a shaded region on a coordinate plane. The region includes all the points that satisfy the inequality, and is usually bounded by a line or curve. For example, the inequality "y > -x + 3" represents the region above the line y = -x + 3 on a coordinate plane.
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Can someone please explain how you do this
The standard error of the mean for the given sample of 375 homes is 0.186. This means that the mean of 4.2, as estimated from the sample, is likely to be within 0.186 of the true population mean.
What is standard deviations?Standard deviation is a measure of the variability or spread of a dataset. It is calculated by taking the square root of the variance, which is the average of the squared differences from the mean. Standard deviation gives a measure of how spread out the values in a dataset are from the mean value. Higher standard deviation indicates greater spread or variability of the values.
The random variable X is the number of people in a household for a given sample size of 375 homes. This random variable is important in estimating the population mean of the number of people in a household.
To calculate the standard error of the mean (SE), we first need to calculate the sample size:
n = 375
Then, we can calculate the standard error of the mean as follows:
SE = (2.1)/(√375)
SE = 0.186
Therefore, the standard error of the mean for the given sample of 375 homes is 0.186. This means that the mean of 4.2, as estimated from the sample, is likely to be within 0.186 of the true population mean.
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Complete questions as follows-
In a certain year; according to a national Census Bureau, the number of people in a household had a mean of 4.39 and a standard deviation of 2.23. This is based on census information for the population. Suppose the Census Bureau instead had estimated this mean using a random sample of 375 homes. Suppose the sample had a sample mean of 4.2 and standard deviation of 2.1 .Identify the random variable X. Indicate whether it is quantitative or categorical What is the random variable X? O A The mean number of people in a household B. The number of people in a household OC. The number of households in the country OD.
a small charter plane company will charter a 50 seat - airplane to a group of 35 people or more. if a group contains exactly 35 people, each person pays $60. if the group has more than 35 people, everybody’s fair is reduced by $1 for each person. determine the size of the group for which the company’s revenue will be the greatest. then, find the maximum revenue.
Therefore, the maximum revenue is $2,925 for a group of 65 people.
What is equation?An equation is a mathematical statement that shows the equality of two expressions, usually consisting of variables and/or constants. It contains an equals sign (=) that separates the expressions on either side of the sign. Equations are used to solve problems, model real-world situations, and represent mathematical relationships. They can be solved by performing operations on both sides of the equals sign until a solution is obtained.
Here,
Let x be the number of people in the group above 35. If the fair is $60 for a group of exactly 35 people, the revenue for this group would be:
R(35) = $60 x 35 = $2,100
For a group of x people, the fair would be:
$60 - $1x
So, the revenue for this group would be:
R(x) = ($60 - $1x) x
Expanding the expression:
R(x) = $60x - $1x²
To find the number of people that maximize revenue, we need to find the vertex of the parabola. The x-coordinate of the vertex is given by:
x = -b/2a
where a = -1 and b = 60
x = -60/(2*(-1))
= 30
So, the size of the group for which the revenue is the greatest is 35 + 30 = 65 people.
To find the maximum revenue, we substitute x = 30 in the equation for R(x):
R(65) = ($60 - $1*30) * 65
= $2,925
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What is the equation for the line in slope-intercept form? Enter your answer in the box.
After answering the provided question, we can conclude that The y-intercept is denoted by b. (the point where the line crosses the y-axis)
what is slope intercept?In mathematics, the slope-intercept form of a linear equation is an equation of the form y = mx + b, where m is the line's gradient and b is the más, which is the point on the line where it intersects the y-axis. Because it allows you to speedily see the line and ascertain its slope and y-intercept, the slope-intercept form is a useful way to represent a line's equation. The slope of the line indicates its steepness, while the esta indicates in which the line intersects the y-axis.
The slope-intercept equation for a line is:
y = mx + b
where:
The dependent variable is y. (usually the vertical axis)
x is the independent variable (usually the horizontal axis)
The slope of the line is given by m.
The y-intercept is denoted by b. (the point where the line crosses the y-axis)
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Liam bought a car for 12,478 the car depreciates at a rate of 7% per year how long until the car is worth less than 3,000
which is the product of 15 and 5/12? A. 5 and 5/12 B. 6 and 1/4 C. 7 and 1/12 D. 7 and 3/4
Answer:
B. 6 1/4
Step-by-step explanation:
[tex]15\cdot \cfrac{5}{12}\implies \cfrac{15\cdot 5}{12}\implies \cfrac{3\cdot 5\cdot 5}{3\cdot 4}\implies \cfrac{5\cdot 5}{4}\implies \cfrac{25}{4}\implies 6\frac{1}{4}[/tex]
PLS ANSWER PLS PLS I HAVE A TEST PLS the function d(t)=1/2 at x 2 can be used to estimate the distance that a dropped object falls into the t seconds. the constant a has a value of 4.8m/s x 2. how far, to the nearest tenth of a meter, does an acorn fall 2.25 secs. 2(2.2)=_____ meters
the acorn falls approximately 12.15 meters (to the nearest tenth of a meter) in 2.25 seconds.
what is gravity ?the natural force that makes things fall to the ground when you drop them.
The given function is:
d(t) = (1/2)a[tex]t^2[/tex]
where a = 4.8 m/[tex]s^2[/tex] is the acceleration due to gravity.
To find the distance an acorn falls in 2.25 seconds, t = 2.25 seconds
d(2.25) = (1/2)(4.8)[tex](2.25)^2[/tex]
= (1/2)(4.8)(5.0625)
= 12.15 meters (rounded to two decimal places)
Therefore, the acorn falls approximately 12.15 meters.
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Please help me find the arc!
Answer:
33
Step-by-step explanation:
135/360 × 2 × 22/7 × 14
= 33
solve this please
please
Since ∠CGB is a right-angle triangle, ∠CGE is measured at 17°.
The opposing angles created by the intersection of two lines are known as vertical angles or vertically opposite angles, and they are always equal in size.
An angle with a measure of exactly 90 degrees (or [tex]\pi[/tex]/2) is referred to as a right angle.
In light of the posed query,
m∠FGA = 73°
Since ∠FGA and ∠BGE are vertical angles,
⇒ ∠mFGA=∠BGE=73°
Now, ∠CGB is a right-angle triangle, therefore,
⇒m∠CGE + m∠EGB = 90°
⇒ x° + 73° = 90°
⇒x° = 90° - 73°
⇒x° = 17°
Hence, the ∠CGE's measure is 17°.
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Write a phrase that could be modeled by the expression n +2n.
Answer:
Let age of mine be n years.
Age of my father is twice of mine -2 n years.
Find the sum of age of me and my father.
= n+2n
Step-by-step explanation:
if it helped you please mark me a brainliest :))
The expression n + 2n is an example of multiplication, where 2n is two times n. Adding n and 2n together results in 3n, which is three times n.
factor out -1/2 from -1/2(x-0)^2+x+4=0
The original equation formed after factoring out [tex]$-\frac{1}{2}$[/tex] is [tex]$$(x-0)^2 - 2x - 8 = 0$$[/tex].
What is meant by factor?
In mathematics, a factor is a number or expression that divides another number or expression evenly without a remainder. Factoring is the process of finding the factors of a number or expression. In algebra, factoring is used to simplify expressions, solve equations, and find zeros of functions. By factoring, we can rewrite a complex expression or equation as a product of simpler expressions or factors.
To factor out [tex]$-\frac{1}{2}$[/tex] from the equation [tex]$-\frac{1}{2}(x-0)^2+x+4=0$[/tex], we can divide both sides of the equation by [tex]-\frac{1}{2}$:[/tex]
[tex]$-\frac{1}{2}(x-0)^2 \div -\frac{1}{2} + x \div -\frac{1}{2} + 4 \div -\frac{1}{2} = 0 \div -\frac{1}{2}$$[/tex]
Simplifying each term, we get:
[tex]$$(x-0)^2 - 2x - 8 = 0$$[/tex]
This is the factored form of the original equation, after factoring out [tex]-\frac{1}{2}$.[/tex]
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A theater has 424 seats there are eight sections of seats in the theater each section has the same number of seats how many seats are in each section
Answer:
53.
Step-by-step explanation:
Talk about any similarities and differences you detect between the groups, as well as what conclusions you can draw from the side-by-side boxplots.
1. To compare, we have to use the matched test.
2. n = 57
3. Sample mean difference = -0.4681
3b. Sample standard deviation of difference = 1.2824
What is the Null Hypothesis?In statistics, the null hypothesis is a statement that suggests there is no significant difference between two groups, samples, or variables being compared. It is a starting point for statistical analysis, and the goal is to either reject or fail to reject this hypothesis based on the evidence from the data.
The images below contains the histogram of differences, the comparison data and the calculation
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Need help will give brainliest and 5 stars for the fastest answers with work.
The function required is g(x) = 2 + x - 4 + (3 - c + b) where a = 4-2+b-c, b = 6 - 3 + c, and c = 2-a-2+b.
What is function?Function is a relationship between two variables. It is represented by an equation that shows the values of one variable in terms of the other.
We can create a new function g(x) to transform f(x) so that it includes the point (-2, 2).
To do this, we need to find the values of a, b, and c where g(x)= a+(x-b)+c.
We know that f(2)=4, f(3)=4, and f(2)=2. We can use these points to solve for a, b, and c.
To solve for a, we can plug in x=2 and solve for a:
a+2-b+c = 4
a = 4-2+b-c
To solve for b, we can plug in x=3 and solve for b:
a+3-b+c = 4
b = 4-a-3-c
To solve for c, we can plug in x=2 and solve for c:
a+2-b+c = 2
c = 2-a-2+b
Now that we have a, b, and c, we can plug them into the equation
g(x) = a + (x-b) + c and get:
g(x) = 4 - 2 + (x - (4-a-3+c)) + (2 - a - 2 + b)
g(x) = 4 - 2 + (x - 4 + a + 3 - c) + (-a - 2 + b + 2)
g(x) = 4 - 2 + (x - 4) + (a + 3 - c - a - 2 + b + 2)
g(x) = 4 - 2 + x - 4 + (3 - c + b)
g(x) = 2 + x - 4 + (3 - c + b)
When we plug in x = -2, we get:
g(-2) = 2 - 2 - 4 + (3 - c + b)
g(-2) = -4 + (3 - c + b)
g(-2) = 2
We can now solve for c and b using the above equation:
-4 + (3 - c + b) = 2
3 - c + b = 6
b = 6 - 3 + c
Therefore, g(x) = 2 + x - 4 + (3 - c + b) where a = 4-2+b-c, b = 6 - 3 + c, and c = 2-a-2+b is the function required.
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Panjang bayangan pohon oleh sinar matahari adalah 15 m. Pada tempat dan saat yang sama tiang bendera sepanjang 3 m memiliki panjang bayangan 6 m. Tinggi pohon adalah …
I was given this question on a review assignment but was never taught this. Please help!
You need to use the formula
pi r squared times the height and all you need to do is plug it in and you’ll have your answer
square root of 98 . simifiy
We can simplify the square root of 98 by factoring 98 into its prime factors:
98 = 2 * 7 * 7
Now, we can take out one factor of 7 from the square root and simplify it:
√98 = √(2 * 7 * 7)
√98 = √2 * √7 * √7
√98 = 7√2
Therefore, the simplified form of the square root of 98 is 7√2.
use π ≈3.14 5mm and round your answer to the nearest hundredth
Answer:
113.04cm2
Step-by-step explanation:
6cm is the radius, right?
If so, 12*3.14 = 37.68cm is the circumference and 6^2*3.14 = 113.04cm2 is the area.
HOPES THIS HELPS
Write down two four digit numbers that are divisible by 25 but not divisible by 2
Answer:
the answer is (25,75,125,175)
which equation should solve to find x a) cos34=10/12 b) tan34=10/x c) cos34=x/12 d) sin34= x/12
Answer:
Step-by-step explanation:
Answer: (d)
[tex]sin34=\frac{opposite}{hypotenuse}=\frac{x}{12}[/tex]
50 high school students were asked how many hours is 30 per day the mean what’s 1.5 hours with the standard deviation of .5 hours using a 5% level of significance what can we claim about the mean study time of the entire population of high school students so that the hypothesis will fail to be rejected
We can claim that the mean study time of the entire population of high school students is not significantly different from 1.5 hours, at a significance level of 0.05.
EquationWe need to perform a hypothesis test using the given information to determine whether the mean study time of the entire population of high school students is different from 1.5 hours.
Null hypothesis: The population mean study time is equal to 1.5 hours.
Alternative hypothesis: The population mean study time is different from 1.5 hours.
On Calculating p value using test statistics, we get p=1.
The p-value for a two-tailed test with 49 degrees of freedom is 1, meaning that there is no evidence to reject the null hypothesis. Therefore, we can claim that the mean study time of the entire population of high school students is not significantly different from 1.5 hours, at a significance level of 0.05.
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Help please! What’s the domain and range?
The domain of the function is Dοmain = [0, 25218]
Range = [0, 45, 90, .....,1134810]
What is domain?In mathematics, the domain of a function is the set of all possible input values (often referred to as the independent variable).
In this case, the maximum capacity of the stadium is 25218 people, so the domain of the function is [0, 25218], including 0 for the case of no attendance.
As we knοw fοr the given questiοn :
• Dοmain will be the number οf peοple whο will be frοm 0 tο 25218
• Range will be the amοunt οf mοney οr revenue which will be [45×0, 45×1, 45×2, ........45×25218]
Sο,
Dοmain = [0, 25218]
Range = [0, 45, 90, .....,1134810]
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find the quartic function that is the best fit for the data in the table below. Report the model with three significant digits in the coefficients.
The quartic function that is the best fit for the given data is:
y = 0.538x^4 + 0.042x^3 - 2.186x^2 + 0.108x
What is a quartic function?A quartic function is described as a fourth-degree polynomial: a function which has, as its highest order term, a variable raised to the fourth power.
We will use a regression analysis in order to find the quartic function that is the best fit for the given data,
Using a regression tool, we obtain the following quartic function that models the data with three significant digits:
y = 0.538x^4 + 0.042x^3 - 2.186x^2 + 0.108x
Therefore, the quartic function that is the best fit for the given data is:
y = 0.538x^4 + 0.042x^3 - 2.186x^2 + 0.108x
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Help please look at the picture
[tex]\textit{volume of a cone}\\\\ V=\cfrac{\pi r^2 h}{3}~~ \begin{cases} r=radius\\ h=height\\[-0.5em] \hrulefill\\ h=8\\ r=12 \end{cases}\implies V=\cfrac{\pi (12)^2 (8)}{3} \\\\\\ V=384\pi \implies \stackrel{using~\pi =3.14 }{V=1206}~cm^3[/tex]