Let f : E → R have this property: For every e ∈ E there is an ε
> 0 so that f(x) > ε if x ∈ E ∩ (e − ε, e + ε). Show that if
E is not closed or is not bounded, then there may
not be some positive number c so that f(e) > c
for all e ∈ E .
If E is not closed or is not bounded, then there may not be some positive number c so that f(e) > c for all e ∈ E .
Suppose that E is not closed, then there exists a limit point a of E such that a ∉ E. For this limit point a, we can choose a sequence of points in E that converges to a. Since f(x) > ε for all x ∈ E ∩ (e − ε, e + ε), we have that f(x) > ε for all x in the sequence that converges to a.
However, since a is not in E, we cannot find an ε > 0 such that f(x) > ε for all x ∈ E ∩ (a − ε, a + ε), so we cannot find a positive number c such that f(e) > c for all e ∈ E.
Now suppose that E is not bounded. Then for every positive number M, there exists a point e ∈ E such that |e| > M. We can choose ε = |e|/2, and then we have that f(x) > ε for all x ∈ E ∩ (e − ε, e + ε). However, since E is not bounded, we can always choose M large enough so that ε = |e|/2 > M, and then we cannot find a positive number c such that f(e) > c for all e ∈ E.
Therefore, if E is not closed or is not bounded, then there may not be some positive number c so that f(e) > c for all e ∈ E.
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Question 7: Let X be a random variable uniformly distributed between 0 and 1 . Let also Y=min(X,a) where a is a real number such that 0
Expected Value of X: E[X] = 1/2. Variance of X: Var[X] = 1/12. Since X is uniformly distributed between 0 and 1, the expected value (E[X]) can be calculated as the average of the endpoints of the distribution:
To find the expected value and variance of X and Y, we will compute each one separately.
Expected Value of X:
E[X] = (0 + 1) / 2 = 1/2
Variance of X:
The variance (Var[X]) of a uniform distribution is given by the formula:
Var[X] =\((b - a)^2 / 12\)
In this case, since X is uniformly distributed between 0 and 1, the variance is:
Var[X] = \((1 - 0)^2 /\)12 = 1/12
Expected Value of Y:
To calculate the expected value of Y, we consider two cases:
Case 1: If a < 1/2
In this case, Y takes on the value of a, since the minimum of X and a will always be a:
E[Y] = E[min(X, a)] = E[a] = a
Case 2: If a ≥ 1/2
In this case, Y takes on the value of X, since the minimum of X and a will always be X:
E[Y] = E[min(X, a)] = E[X] = 1/2
Variance of Y:
To calculate the variance of Y, we also consider two cases:
Case 1: If a < 1/2
In this case, Y takes on the value of a, which means it has zero variance:
Var[Y] = Var[min(X, a)] = Var[a] = 0
Case 2: If a ≥ 1/2
In this case, Y takes on the value of X, and its variance is the same as the variance of X:
Var[Y] = Var[min(X, a)] = Var[X] = 1/12
Assuming risk-neutrality, the maximum amount an individual would be willing to pay for this random variable is its expected value. Therefore, the maximum amount an individual would be willing to pay for Y is:
Maximum amount = E[Y] = a, if a < 1/2
Maximum amount = E[Y] = 1/2, if a ≥ 1/2
Expected Value of X: E[X] = 1/2
Variance of X: Var[X] = 1/12
Expected Value of Y:
- If a < 1/2, E[Y] = a
- If a ≥ 1/2, E[Y] = 1/2
Variance of Y:
- If a < 1/2, Var[Y] = 0
- If a ≥ 1/2, Var[Y] = 1/12
Maximum amount (assuming risk-neutrality):
- If a < 1/2, Maximum amount = E[Y] = a
- If a ≥ 1/2, Maximum amount = E[Y] = 1/2
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Let X be a random variable uniformly distributed between 0 and 1 . Let also Y=min(X,a) where a is a real number such that 0<a<1. Find the expected value and variance of X and Y. Assuming that you are risk-neutral.
Looking for help!
Question: The temperature at 9am was 12.5 degrees below zero. By 1pm the temperature was 20.3 degrees. What was the change in temperature?
Answer:
The change was 32.8 degrees.
Step-by-step explanation:
Quite a lot. Very unusual.
-12.5 to 20.3
You need to add 12.5 just to get to 0. Then you add 20.3 to get the high temperature, So the answer is 12.5 + 20.3 = 32.8. That in centigrade would be a huge move. In Fahrenheit not so much but still pretty big.
The table represents a function.
Xx
-4
-1
3
5
f(x)
-2
5
4
-8
What is f(5)?
-8
-1
1
8
Therefore , the solution to the given problem of function comes out to be f(5) = -8.
What does the word function mean?Mathematics encompasses variables and their changes, equations and related structures, form locations and forms themselves. The relationship between a number of inputs, each of which has an associated output, is referred to as a "function." An association between inputs and outputs that yields a single, distinct outcome is known as a function. Each function has a realm and with a requested request, or scope, allocated to it. The letter f is frequently used to represent , equation functions (x). An x is entered. The four primary kinds of activities that are offered are on activities, each functions, numerous features, within characteristics, and on functions.
Here,
Given :
x -4 -1 3 5
=> f(x) -2 5 4 -8
The value of f(x) at x = 5 is f(5).
=> f(5) = -8
Therefore , the solution to the given problem of function comes out to be f(5) = -8.
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WHAT WOULD THIS BEEEEEEE!!
Answer:
c) 30
Step-by-step explanation:
since the lines are parallel, 75° = 2x + 15°
this is because when two parallels lines are intersected by the same line, all respective angles are equal. Also, opposite angles on a line are equal too.
So now that u have 75 = 2x + 15, just solve for x by simplifying:
75 = 2x + 15
60 = 2x
30 = x
so the answer is c) 30
hope this helps!
PLEASE HELP! I NEED ALL OF THEM ANSWERED! FIRST GETS BRAINLIEST!
The angle measures for this problem are given as follows:
A = 63º.B = 138º.C = 117º.D = 114º.Then the four letter code is given as follows:
FBCA.
How to obtain the angle measures?For angle A, first we have that (2x + 35)º and (8x - 40)º are vertical angles, hence the value of x is obtained as follows:
8x - 49 = 2x + 35
6x = 84
x = 84/6.
x = 14
This means that the measure of angle A is obtained as follows:
m<A = 2(14) + 35 = 28 + 35 = 63º.
For angle B, the two angles are supplementary, hence the value of x is given as follows:
10x - 18 + 15x + 48 = 180
25x = 150
x = 150/25
x = 6.
Then the measure of angle B is given as follows:
m < B = 15x + 48 = 15(6) + 48 = 138º.
For angle C, the alternate interior angles are congruent, hence the value of x is obtained as follows:
7x + 5 = 12x - 75
5x = 80
x = 16.
Then the measure of angle C is obtained as follows:
m<C = 7x + 5 = 7(16) + 5 = 117º.
For item 4, the angles form a linear pair, meaning that they are supplementary and the value of x is obtained as follows:
27x - 21 + 10x + 16 = 180
37x = 185
x = 185/37
x = 5.
Then angle D is calculated as follows:
m < D = 27x - 21 = 27(5) - 21 = 114º.
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16. James is buying school supplies. He
buys a notebook for $2.45, a package
of mechanical pencils for $3.79, and an
eraser for $1.55. Use mental math to find
how much he spent in all.
? spent
$2.45
?
$3.79
$1.55
After using mental math to find how much he spent in all, we have come to find that total cost of notebook, pencils and eraser is $7.79
What is mental math?A set of abilities known as mental math enable people to perform calculations "in their heads" without the aid of paper and pencil or a calculator. Recalling math facts, such as 8 x 5 = 40, is one of these abilities. Rounding numbers and estimating calculations are additional abilities.
It is the process of performing mathematical calculations and problem-solving without the need for a lengthy physical process or a formal written process. Children will learn to perform mental addition, subtraction, and other calculations that call for the use of all four operations as well as particular methods.
Students will be able to solve a variety of problems without having to memorize equation solutions, pull out a calculator, or use a pen and paper for their calculations thanks to these mental techniques.
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Answer: $7.79
Step-by-step explanation:
1. What is the value of x in the right triangle shown?
Answer:
15mm
Step-by-step explanation:
Here, Pythagoras Theorem will be used, which states that,
(BASE)² + (HEIGHT)² = (HYPOTENUSE)²
Base = x mmHeight = 8 mmHypotenuse = 17 mmPutting the values accordingly,
(17)² = (8)² + (x)²
(x)² = (17)² - (8)²
(x)² = 225
x = 15 mm
Hope it helps :)
Answer:
15mm
Step-by-step explanation:
Hypotenuse of a triangle^2 = a^2 + b^2
=> 17^2 mm = 8^2mm + x^2mm
=> 289mm = 64mm + x^2mm
=> 289mm - 64mm = x^2mm
=> 225mm = x^2mm
=> √225mm = x mm
=> 15mm = x
Hope you understood!!
let say that x, y, z are regular unix user processes and x’s parent is y and y’s parent is z. when process y dies, what would happen?
The exact behavior and consequences depend on the Operations system's process management mechanisms and the actions taken by process z or the system's process manager.
When process y dies, the Operations system handles the termination of the process and performs certain actions related to its termination. Here are the likely outcomes when process y, with process x as its child and process z as its parent, dies:
1. Process y's termination: When process y dies, the operating system marks it as terminated and frees up any system resources that were allocated to it. This includes releasing memory, closing file descriptors, and removing its entry from the process table.
2. Parent-child relationship: Since process x is the child of process y, the operating system updates the parent-child relationship. Typically, when a parent process dies, the child process is reassigned to another process called the init process or is terminated if no other process adopts it. The exact behavior depends on the operating system's process management policies.
3. Process z's status: Process z, being the parent of process y, may receive a notification or a signal indicating the termination of its child process. The operating system usually sends a SIGCHLD signal to the parent process, allowing it to handle the termination of its child process appropriately. Process z can choose to ignore the signal or perform actions such as cleaning up resources or spawning a new child process to replace the terminated one.
4. Orphaned process: If process z does not handle the termination of process y appropriately or if process z itself terminates before process y, process x becomes an orphaned process. Orphaned processes are typically adopted by the init process or the system's process manager, ensuring that they are handled and terminated properly.
In summary, when process y dies, the operating system marks it as terminated, updates the parent-child relationship, and may notify process z. The exact behavior and consequences depend on the operating system's process management mechanisms and the actions taken by process z or the system's process manager.
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choose the statement that best explains the use of the sample standard deviation in tests of the mean where the population standard deviation is not known.
The correct answer is option A. The sample standard deviation can be used as an estimate of the population standard deviation is the statement that explains the use of the sample standard deviation in tests of the mean when the population standard deviation is not known.
By taking the square root of the variance, the sample standard deviation—a measurement of the data's propagation derived. A sample, which is a smaller portion of the population, is used to calculate it.
The sample standard deviation can be used as an estimate of the population standard deviation because the population standard deviation is typically unknown.
Following that, confidence intervals and other tests of the mean can be computed using this.
The sample standard deviation is another tool used to assess the data's variability because it shows how dispersed the data exists.
Complete Question:
Choose the statement that best explains the use of the sample standard deviation in tests of the mean when the population standard deviation is not known:
A. The sample standard deviation can be used as an estimate of the population standard deviation.
B. The sample standard deviation can be used to measure the spread of the data.
C. The sample standard deviation can be used to calculate the confidence interval.
D. The sample standard deviation can be used to measure the variability of the data.
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Write the equation of the line that passes through (2,7) and (0, 1).
Pls someone I need the answer nowwww
Answer:
y=3x+1
Step-by-step explanation:
First, you need to find the slope. With the two points you can find the slope by subtracting one point from the other. This gives you a slope of 3. You could plot this on a graph to get the +1, or you can just look at these two points. (0,1) just gives it to you because this point is on the line.
Solve the following....
\(2(x-3)=2x+4\)
Answer:
No answer. The question is not correct. 2x-6 cannot be equal to 2x+4
Step-by-step explanation:
2(x-3) = 2x+4
2x-6 = 2x+4
This can't be true. 2x-6 cannot be equal to 2x+4:
Subtract 2x from both sides and we are left with -6 = 4: FALSE
Answer:
no solutionStep-by-step explanation:
Taking the LHS and distributing
2(x - 3)2(x) - 2(3)2x - 6Equating to the RHS
2x - 6 = 2x + 4On inputting any value for x, this equation will not be correct.
Hence, it has no solution.
Find the slope plz help ASAP!!
What is the value of the product (3 – 2i)(3 2i)? 5 9 4i 9 – 4i 13
Answer:
\(\left( 3-2i\right) \left( 3+2i\right) =13\)
Step-by-step explanation:
Note :
i² = −1
(a - b)(a + b) = a² - b²
________________
\(\left( 3-2i\right) \left( 3+2i\right) =3^{2} - (2i)^2\)
\(=9 - (2)^2\times i^2\)
\(=9 - 4(i)^2\)
\(=9-4\times(-1)\)
\(=9+4\)
\(=13\)
Answer: (3 – 2i)(3 2i)=13
Step-by-step explanation:
edge2020
20/3=2(w+2/3)
What’s the value of w
Answer: w=8/3
Step-by-step explanation:
Step 1: Simplify both sides of the equation.
20 /3 =2(w+ ( 2 /3 )
20 /3 =(2)(w)+(2)( 2 /3 )(Distribute)
20 /3 =2w+ 4 /3
Step 2: Flip the equation.
2w+ 4 /3 = 20 /3
Subtract 4/3 from each side: 2w+ 4 /3 − 4 /3 = 20 /3 − 4 /3
Divide both sides by 2: 2w/ 2 =16 3 /2
Answer w=8/3
Answer:
w=8/3
Step-by-step explanation:
Explain how two samples can have the same mean but different standard deviations. Draw a bar graph that shows the two samples, their means, and standard deviations as error bars.
Two samples can have the same mean but different standard deviations due to the spread of data around the mean. Standard deviation is a measure of how much the data values differ from the mean. The greater the deviation of the data points from the mean, the greater the standard deviation.
Two samples can have the same mean but different standard deviations because standard deviation is a measure of the spread of data around the mean. If the data values are tightly clustered around the mean, the standard deviation will be small. If the data values are spread out around the mean, the standard deviation will be large. Therefore, two samples can have the same mean but different standard deviations because the spread of data around the mean can be different for each sample.
Two samples can have the same mean but different standard deviations because the spread of data around the mean can be different for each sample. For example, consider two samples of test scores. Sample A has a mean score of 80 and a standard deviation of 5. Sample B has a mean score of 80 and a standard deviation of 10. The scores in Sample B have more variability than the scores in Sample A.In a bar graph, the means of the two samples can be represented by two bars with the same height. The standard deviations of the two samples can be represented by error bars on each bar. The error bars show the variability of the data in each sample. The length of the error bars for Sample B would be longer than the length of the error bars for Sample A.
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please help cause its due later!!!
The missing numbers can be filled up as follows:
1. 200
2. 20%
3. 225
4. 800
5. 2%
How to fill up the tableTo fill up the table, note that percentage is obtained by dividing a base by rate. The rate will also be changed to the decimal format before the computation is done. On this note:
P = B * R
1. 20 = x * 0.1
20 = 0.1x
Divide both sides by 0.1
x = 200
2. 90 = 450 * R
R = 90/450
R = 0.2 OR 20%
3. P = 900 * 0.25
P = 225
4. 280 = B * 0.35
B = 280/0.35
B = 800
5. 14 = 700 * R
R = 14/700
R = 0.02 OR 2%
So, with the given formula, we could generate the base, rate, and percentages of the numbers.
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3x5+9^2/(27x1 third)-negative 10
The solution to the algebraic expression 3 × 5 + (9²/(27 × ¹/₃)) - (-10) using order of operations is; 34
How to carry out order of operations?The order of operations is mathematical operations is as follows: PEMDAS which denotes parentheses, exponents, multiplication, division, addition, then subtraction.
We want to solve the algebraic expression;
3 × 5 + (9²/(27 × ¹/₃)) - (-10)
Let us first solve the numerator to get;
15 + (81/(27 × ¹/₃)) - (-10)
Let us now solve the denominator to get;
15 + (81/9) + 10
= 15 + 9 + 10
= 34
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a=h(b+c) solve for c
Answer:
The expression for c is;
\(c=\frac{a}{h}-b\)Explanation:
Given the below expression;
\(a=h(b+c)\)We want to find the expression for c;
Firstly, let's divide both sides by h;
\(\begin{gathered} \frac{a}{h}=\frac{h(b+c)}{h} \\ \frac{a}{h}=b+c \end{gathered}\)Then, we can now subtract b from both sides;
\(\begin{gathered} \frac{a}{h}-b=b-b+c \\ \frac{a}{h}-b=c \\ c=\frac{a}{h}-b \end{gathered}\)Therefore, the expression for c is;
\(c=\frac{a}{h}-b\)Help I will be marking brainliest!!!
A. 241 ft
B. 358 ft
C. 258 ft
D. 341 ft
Answer:
c. is the correct answer
mark me as brainlist
Is the set of negative integers a commutative group under the operation of addition? if not, why not? select all that apply.
The set of negative integers is a commutative group under the operation of addition.
For given question,
We need to check whether the set of negative integers is a commutative group under the operation of addition.
We know that negative integers are whole numbers that have value less than zero.
We know that, for any positive integers a, b,
a + b = b + a .......................(1)
For any negative integers -a, -b
(-a) + (-b) = -a - b
= -(a + b)
= -(b + a) ...............(From (1))
= -b - a
= (-b) + (-a)
As, (-a) + (-b) = (-b) + (-a) for any negative integers -a, -b, the set of negative integers is a commutative group under the operation of addition.
Therefore, the set of negative integers is a commutative group under the operation of addition.
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What is the midpoint of the segment shown below?
10.
(-3,4)
O A. (-3.3)
O B. (-9,3)
- (-6,-1)
10
C. (- )
D. (-9,3)
Need help please
Answer:
(-9/2,3/2)
Step-by-step explanation:
x coordinate of mid point=(x1+x2)/2
y coordinate of mid point=(y1+y2)/2
Please help fast. PLEASE PLEASE PLEASE
Answer:
D
Step-by-step explanation:
By subtracting the second part of the equation, you are doing the same as adding a negative.
#11
write the equation of a line in point slope-form
Answer:
y - 5 = 1/4 (x+1)
Step-by-step explanation:
y - 5 = 1/4 (x - (-1))
to simplify the problem you can change (x - (-1)) to (x+1) because subtracting a negative is the same as adding a positive
y - 5 = 1/4 (x+1)
and that is your final answer if you want to keep it in point slope formula
on average, an individual's bmr decreases approximately 3 to 5 percent per decade after what age? a. 20 b. 50 c. 30 d. 70
An individual's BMR decreases approximately 3 to 5 percent per decade on an average after the age of option C. 30.
BMR is known as basal metabolic rate which decreases when the age of a person increases.As metabolism factor slow down with the increase in age.After the age of 30 metabolism rate decreases which effect basal metabolic rate every decade by round about 3 to 5 percent.At the young age expenditure of the daily energy is quiet more compare to older age.On an average after the age of 30 BMR is decreases approximately by 3 to 5 percent.
Therefore, on an average individuals BMR is approximately decreases by round about 3 to 5 percent per decade after the age of option c. 30.
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I NEEED HEELPPPP PLEASE 15 POINTS
Answer:
D
Step-by-step explanation:
Its on the same line so..
Answer:
D
Step-by-step explanation:
What is the gcf of 4? this is worth 25 points I think
Answer:
The greatest common factor of 4 is 4
Step-by-step explanation:
1*4
2*2
4 is the biggest number that goes into 4
The tee for the sixth hole on a golf course is 305 yards from the tee. On that hole, Marsha hooked her ball to the left, as sketched below. Find the distance between Marsha’s ball and the hole to the nearest tenth of a yard.
Answer:
Correct answer is option D. 96.4 yd.
Step-by-step explanation:
Please refer to the attached figure for labeling of the given diagram.
ABC is a triangle with the following labeling:
A is the hole, B is the Tee and C is the point where the ball is.
Sides are labeled as:
\(a =255\ yd\\c = 305\ yd\\\angle B =17^\circ\)
To find:
Side \(b = ?\)
Solution:
Here, we have one angle and two sides . Third side of the triangle is to be found opposite to the given angle.
We can use cosine formula here to find the value of the unknown side.
\(cos B = \dfrac{a^{2}+c^{2}-b^{2}}{2ac}\)
Putting all the values:
\(cos 17 = \dfrac{255^{2}+305^{2}-b^{2}}{2\times 255\times 305}\\\Rightarrow 0.956 = \dfrac{65025+93025-b^{2}}{155550}\\\Rightarrow 148753.2= 158050-b^{2}\\\Rightarrow b^{2}= 158050-148753.2\\\Rightarrow b^{2}= 9296.795\\\Rightarrow b= 96.42\ yd\)
So, the distance between the Ball and hole is 96.42 yd
Correct answer is option D. 96.4 yd.
Answer:
D.) 96.4 yd
Step-by-step explanation:
I got it correct on founders edtell
Together, Chelsea and Essence have $192. If Chelsea has a third of the amount of money that Essence has, find out how much money each person has individually.
Answer:
Chelsea has $48, Essence has $144
Step-by-step explanation:
You have 2\3 of a pizza left from yesterday. You divide it into 4 equal pieces. What fraction of the pizza is each piece?
Step-by-step explanation:
that means we divide 2/3 by 4.
2/3 / 4 = 2/3 / 4/1 = 2/3 × 1/4 = 2/12 = 1/6
so each quarter of the remaining 2/3 pizza is actually 1/6 of the complete pizza.