s) An e-mail lter is planned to separate valid e-mails from spam. The word free occurs in 50% of the spam messages and only 3% of the valid messages. Also, 20% of the messages are spam. Determine the following probabilities: (a) The message contains the word free. (b) The message is spam given that it contains free. (c) The message is valid given that it does not contain free.

Answers

Answer 1

Answer:

A) P(F) = 0.124

B) P(S|F) = 0.8065

C) P(V|F^(c)) = 0.886

Step-by-step explanation:

Let us denote as follows;

F = Message contains word free

S = message is spam

V = message is valid

From the question, we are given that;

The probability that word free occurs in spam messages;P(F|S) = 50% = 0.5

The probability of the valid messages that contain free; P(F|V) = 3% = 0.03

Spam messages; P(S) = 20% = 0.2

Valid messages; P(V) = 1 - 0.2 = 0.8

A) From rule of total probability ;

probability that the message contains the word free is given as;

P(F) = P(F|S)•P(S) + P(F|V)•P(V)

P(F) = (0.5 x 0.2) + (0.03 x 0.8)

P(F) = 0.124

B) From Baye's theorem;

probability that the message is spam given that it contains free is given as;

P(S|F) = P(F|S)•P(S)/P(F)

P(S|F) = (0.5 x 0.2)/0.124

P(S|F) = 0.8065

C) From combination of complement rule and Baye's theorem;

probability that the message is valid given that it does not contain free is given as;

P(V|F^(c)) = P(F^(c)|V)•P(V)/P(F^(c))

Thus,

P(V|F^(c)) = [(1 - P(F|V))•P(V)]/(1 - P(F))

P(V|F^(c)) = ((1 - 0.03)•0.8)/(1 - 0.124)

P(V|F^(c)) = 0.776/0.876

P(V|F^(c)) = 0.886


Related Questions

If a bike is $125 how much will it be when its discounted by 20%

Answers

Answer:

160 pages.

Step-by-step explanation:

That is 125 - 0.20 * 125

= 125 - 25

= 160 pages.

Answer:

The answer is you saved $25.00 and the new total is $100.00

Step-by-step explanation:

so first you set up the equation of is over of = percent over 100

[tex]\frac{a}{125}=\frac{20}{100}\\\\[/tex]

then simplify the [tex]\frac{20}{100}=\frac{1}{5}[/tex]

then you see if 5 can go into 125. It can so you divide 125 by 5=25

so you multiply the [tex]\frac{1}{5}=\frac{25}{125}[/tex]

so now you just [tex]\frac{a}{125}=\frac{25}{125}[/tex]

then you just subtract the 25 because that is how much you are saving and your total will be $100.00

An airplane is at a location 800 miles due west of city X. Another airplane is at a distance of 1,200 miles southwest of city X. The angle at city X created by the paths of the two planes moving away from city X measures 60°. What is the distance between the two airplanes to the nearest mile? Assume that the planes are flying at the same altitude. A. 894 miles B. 1,058 miles C. 646 miles D. 1,251 miles

Answers

Answer:

The distance between the two airplanes (to the nearest mile) is 1058 miles.

Step-by-step explanation:

Use Law of cosines  

d = √(800^2 + 1200^2 - 2·800·1200·COS(60°)) = 1058 miles

Answer:

1058

Step-by-step explanation:

Plato

3(n+2)=9(6-n)
help me please

Answers

Answer:

n=4

Step-by-step explanation:

3n+6 = 54-9n

3n+9n = 54 - 6

12n = 48

n=4

Answer:

4

Step-by-step explanation:

3n+6=54-9n

3n+9n=54-6

12n=48

n=48/12

n=4

MARK AS BRAINLIESTAND FOLLOW

What is the value of AAA when we rewrite \left(\dfrac {6}{17}\right)^{9x}( 17 6 ​ ) 9x (, start fraction, 6, divided by, 17, end fraction, ), start superscript, 9, x, end superscript as A^{x}A x A, start superscript, x, end superscript ?

Answers

The value of A is [tex]\left( \dfrac{6}{17}\right)^{9}[/tex].

Given that,

Equation; [tex]\rm \left(\dfrac{6}{17}\right)}^{9x}[/tex]

We have to find,

The value of A when the function is written as [tex]\rm A^x[/tex]?

According to the question,

To determine the value [tex]A^x[/tex] by applying the exponent property in the equation following all the steps given below.

By using the exponent property rewrite the equation,

[tex]\rm \left ( a )\right ^{mn} = ( a^m )\right^{n}[/tex]

Applying the property in the equation,

[tex]\rm \left(\dfrac{6}{17}\right)}^{9x}= \left( \left(\dfrac{6}{17}\right)^{9}\right) \right)^{x}[/tex]

By comparing the equation with [tex](A)^{x}[/tex],

[tex]\rm A ^{x}= \left( \left(\dfrac{6}{17}\right)^{9}\right) \right)^{x}\\\\A = \left( \dfrac{6}{17}\right)^{9}[/tex]

Hence, The required value of A is [tex]\left( \dfrac{6}{17}\right)^{9}[/tex].

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The value of [tex]\( A \)[/tex] when rewriting [tex]\( \left( \frac{6}{17} \right)^{9x} \) as \( A^x \) is \( \left( \frac{6}{17} \right)^9 \)[/tex]. The correct answer is option B) [tex]\( A = \left( \frac{6}{17} \right)^9 \)[/tex] .

Step 1

Let's break down the calculation step by step to rewrite [tex]\( \left( \frac{6}{17} \right)^{9x} \) as \( A^x \)[/tex].

Given:

[tex]\[ \left( \frac{6}{17} \right)^{9x} \][/tex]

To express this in the form [tex]\( A^x \)[/tex], we observe that [tex]\( \left( \frac{6}{17} \right)^{9x} \)[/tex] can be rewritten using exponent rules:

[tex]\[ \left( \frac{6}{17} \right)^{9x} = \left( \left( \frac{6}{17} \right)^9 \right)^x \][/tex]

Now, calculate [tex]\( \left( \frac{6}{17} \right)^9 \)[/tex] :

[tex]\[ \left( \frac{6}{17} \right)^9 = \frac{6^9}{17^9} \][/tex]

Step 2

Calculate [tex]\( 6^9 \)[/tex] and [tex]\( 17^9 \)[/tex]:

[tex]\[ 6^9 = 10077696 \][/tex]

[tex]\[ 17^9 = 1667988092 \][/tex]

So,

[tex]\[ \left( \frac{6}{17} \right)^9 = \frac{10077696}{1667988092} \][/tex]

Therefore, [tex]\( A \)[/tex] in [tex]\( A^x \)[/tex] is:

[tex]\[ A = \left( \frac{6}{17} \right)^9 \][/tex]

Thus, the correct answer is:

B) [tex]\( A = \left( \frac{6}{17} \right)^9 \)[/tex].

Complete question : What is the value of A when we rewrite [tex]\( \left( \frac{6}{17} \right)^{9x} \) as \( A^x \)[/tex]?

A) [tex]\( A = \frac{54}{17} \)[/tex]

B) [tex]\( A = \left( \frac{6}{17} \right)^9 \)[/tex]  

C) [tex]\( A = \left( \frac{17}{6} \right)^9 \)[/tex]

D) [tex]\( A = -\frac{1}{9} \)[/tex]

What is line LB?
Diameter
Radius
Tangent
Chord

Answers

Answer:

Chord

Step-by-step explanation:

It's a chord because if you Google the examples of all the lines, Chord looks the most like Line LB

The line LB is the Diameter

Argue whether or not you believe using a sample of students from your school's cafeteria (you recruit the next 100 people to visit the cafeteria to participate) may or may not yield biased estimates based on the variable being measured/research question being investigated in each of the following situations.

a. Using the proportion of students with Type O blood to learn about the proportion of U.S. adults with Type O blood
b. Using the proportion of students who eat fast food regularly to learn about the proportion of U.S. college students who eat fast food regularly

Answers

Answer: A. Representative, since blood types are probably not different among students at the cafeteria compared to the U.S. population, B. Not representative, since students in the cafeteria may eat most of their meals at the cafeteria instead of eating fast food

Step-by-step explanation:

I Hope that this helps! :)

a) The variable used gives the appropriate estimate.

b) The variable used does not give the appropriate estimate.

What is Research in statistic?

Statistical research is the methodical creation of enhanced or novel statistical techniques based on statistical theory and probability.

A property that can be measured and given varied values is known as a variable. Variables include things like height, age, income, province of birth, school grades, and kind of dwelling. There are two basic types of variables: category and numeric.

Given:

a) Since kids in the cafeteria probably have the same blood types as people in the United States.

So, it can be Representative.

b) As opposed to eating fast food, students may eat the majority of their meals in the cafeteria.

So, this is not representative.

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I need help ASAP please

Answers

Answer:

  A.  (2, 7), (1, 4)

Step-by-step explanation:

The first equation tells you that y cannot be negative. (Both terms are positive.) So, the only viable answer choice is A.

1. 60,000 is _____ times greater than 6,000.
2. 60,000 is _____ times greater than 600.
3. 60,000 is _____ times greater than 60.
4. 2.0 is _____ times greater than 0.2.
5. 2.0 is ______ times greater than 0.02.
6. 2.0 is _____ times greater than 0.002.

Answers

Answer:

1. 60,000 is __10_ times greater than 6,000.

2. 60,000 is __100__ times greater than 600.

3. 60,000 is _1000__ times greater than 60.

4. 2.0 is _10___ times greater than 0.2.

5. 2.0 is __100__ times greater than 0.02.

6. 2.0 is _1000___ times greater than 0.002.

Step-by-step explanation:

I mean, you can divide any number by the other number to get the answer

for example 60000/6000 = 10, or you can just count the difference in decimal points for example 60000 has 1 more 0 than 6000 so you know its 10x greater

To determine how a city's residents feel about building a new youth center, a group considers surveying 50 random children at a local elementary school. Why would this result in a biased sample? Select three answers.

Answers

Answer:

This would most probably result in biased sample since only a specific part of the community is being surveyed that does not represent all of the community.

Step-by-step explanation:

A survey is being conducted to determine how a city's residents feel about building a new youth center.

They are considering to survey 50 random children at a local elementary school.

This would most probably result in biased sample since only a specific part of the community is being surveyed that does not represent all of the community.

Moreover, it is likely that the students of elementary school might not even have any interest in youth center so results would be biased.

Therefore, it is suggested to include a variety of samples that is surveying different age groups that covers all of the community.

Answer:

1. The survey is only considering elementary school students, but not children in middle school or high school.

2. The survey is also not considering any adult at all. Most likely they represent the majority of the local residents.

3. Finally, it's important to understand in advance what would be the main differences with the current youth center and include those specific questions in the survey. It's important to determine if the new youth center will fill the gap.

Step-by-step explanation:

Due to a manufacturing error, 2 cans of regular soda were accidentally filled with diet soda and placed into a24 -pack.
Suppose that two cans are randomly selected from the 24-pack. Complete parts (a) through (c).
(a) Determine the probability that both contain diet soda.
P(both diet) = (Round to four decimal places as needed.)
(b) Determine the probability that both contain regular soda.
P(both regular) = (Round to four decimal places as needed.)
Would this be unusual?
No
Yes
(c) Determine the probability that exactly one is diet and exactly one is regular.
P(one diet and one regular) = (Round to four decimal places as needed.)

Answers

Answer:

a) 1/48 or 2.0833%

b) 46/48 or 95.8333%

no it would not be unusual

c) I'm not sure sorry

In a follow-up obedience experiment, Stanley Milgram used 40 new teachers to determine whether participants obeyed because the learners' protests were not convincing. The new teachers complied fully, to the last switch, _____ percent of the time.

Answers

Answer: 65

Step-by-step explanation:

participants obeyed because the learners' protests were not convincing. The new teachers complied fully, to the last switch, 65 percent of the time.

One angle of an isosceles triangle measures 50º. Which other angles could be in that
isosceles triangle? Choose all that apply.
Answer:
50° , 80°, 65°​

Answers

the sum of the angles in a triangle is 180°

=>180-50=130

def: in an isosceles triangle two angles measure the same

case 1: if two angles measure 50°

180-2*50=80

=> angles: 50, 80

case 2: if the other 2 angles measure the same

(180-50)/2=130/2=65

=> angle: 65

An electronic company makes educational apps for 5 subjects including math. The app has 10 versions, with a different avatar in each version. One version has an avatar that looks similar to a lion. The company is randomly giving free apps to its customers. Find the probability of randomly receiving a math app with a lion avatar. How likely is the probability of receiving the app at random?

Answers

Answer:

2%, low probability

Step-by-step explanation:

In this case we have that the avatars are distributed as follows:

5 subjects and 10 versions of the application for each subject, therefore they are a total of:

5 * 10 = 50

In total there are 50 avatars.

To know the probability that I get 1 in specific, in this case that of a lion is:

1/50 = 0.02

The probability is 2%, that is to say a really low probability, that is to say that the most probable thing is that you do not receive it.

Answer:

2%

Step-by-step explanation:

A punch recipe calls for 4 cups of lemonade to 3 cups of sparking juice.If sara is making 42 cups of punch then how many cups of lemonade does she need

Answers

For 42 cups of punch 168 cups lemonade is used.

What is Unitary Method?

The unitary technique involves first determining the value of a single unit, followed by the value of the necessary number of units.

For example, Let's say Ram spends 36 Rs. for a dozen (12) bananas.

12 bananas will set you back 36 Rs. 1 banana costs 36 x 12 = 3 Rupees.

As a result, one banana costs three rupees. Let's say we need to calculate the price of 15 bananas.

This may be done as follows: 15 bananas cost 3 rupees each; 15 units cost 45 rupees.

We have, For one punch 4 cups of lemonade to 3 cups of sparking juice is used.

Now, for 42 cups the amount of Lemonade needed

= 4 x 42

= 168 cups

and, Amount of Sparking juice needed

= 3 x 42

= 126 cups

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A shipping container holds 40 tissue boxes the dimensions of a tissue box are 4 inches by 6 inches by 3 inches what is the volume of the shipping container

Answers

Answer:

The volume of shipping container is 2880 cubic inches.

Step-by-step explanation:

We are given the following in the question:

Dimensions of tissue box =

4 inches by 6 inches by 3 inches

Volume of tissue box =

[tex]V = l \times w\times h\\V = 4\times 6\times 3\\V = 72\text{ cubic inches}[/tex]

Number of tissue box in shipping container, n = 40

Volume of shipping container =

[tex]V = n\times \text{Volume of tissue box}\\V = 40\times 72\\V = 2880\text{ cubic inches}[/tex]

Thus, the volume of shipping container is 2880 cubic inches.

This question is based on volume of cuboid. Therefore, the volume of the shipping container is 2880 cubic inches.

Given:

A shipping container holds 40 tissue boxes the dimensions of a tissue box are 4 inches by 6 inches by 3 inches.

We need to calculating the  volume of the shipping container.

According to this question,

It is given that, dimensions of tissue box =  4 inches by 6 inches by 3 inches

As we know that,

Volume of tissue box = [tex]length \times breadth \times height[/tex]

[tex]= 4 \times 6 \times 3\\= 72 \, inch^3[/tex]

As it is given that, number of tissue box in shipping container, n = 40.

[tex]Volume \,of \,40\, tissue \,box = n \times 72\\\\Volume \,of \,40 \,tissue \,box = 40 \times 72\\\\Volume \,of \,40 \,tissue \,box = 2880 \, inch^3[/tex]

Therefore, the  volume of the shipping container is 2880 cubic inches.

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express the linear equation 3=2x in the form of ax+by+c=0 indicate the value of a,b and c

Answers

Answer:

0x^2 + 2x -3 = 0

a = 0

b = 2

c = -3

Step-by-step explanation:

3 = 2x

0 = 2x - 3 (move three to other side)

0x^2 + 2x -3 = 0  (Finish off the equation by adding zeros in the empty spots to make the eeqution ax^2 + bx + c = 0)

a = 0

b = 2

c = -3


A company is designing a new cylindrical water
bottle. The volume of the bottle will be 162 cm3.
The height of the water bottle is 7.7 cm. What is
the radius of the water bottle? Use 3.14 for It.

Answers

Answer:

21

Step-by-step explanation:

To find the area of a cylinder you mutliply radius by height.

r*h = 162

If we know the height is 7.7, substitute it for h.

r*7.7 = 162.

Or:

162 / 7.7

Which gives you 21.03, or 21.

A builder is putting in a circular patio. Find the circumference by using 22/ 7 as an estimate for . What is the circumference if the radius is 5 yards.

Answers

Answer:

110/7 yards

Step-by-step explanation:

Given:-

- The radius of circular patio, r = 5 yards

Find:-

What is the circumference of circular patio

Solution:-

- The circumference "C" of a circle is given as:

            [tex]C =2 *\pi*r\\\\\pi = \frac{22}{7} \\\\ C = 2*\frac{22}{7}*5\\\\C = \frac{110}{7} yards[/tex]

- The circumference of the circular patio is 110 / 7 yards.            

A beam of light is transmitted through a medium with an index of refraction of 1.46. What is the speed of the light beam as it travels through the medium?

Answers

Answer:

The speed of light through the medium is 2.1 * 10^8 m/s

Step-by-step explanation:

In this question, we are asked to calculate the speed of light beam as it travels through a medium given the refractive index of the medium.

Mathematically;

n = c/v

where n is the refractive index, v is the speed of light through the medium and c is the speed of light in a vacuum.

From the question, we can identify that the refractive index is 1.46 and the speed of light through vacuum is 3 * 10^8 m/s

Rearranging the equation; we have;

v = c/n

v = (3 * 10^8)/1.46

v = 2.1 * 10^8 m/s

The frequency of the musical note C4 is about 261.63 Hz.
What is the frequency of the note a perfect fifth below C4?
130.82 Hz
174.42 Hz
256.63 Hz
392.44 Hz​

Answers

Final answer:

The frequency of the note a perfect fifth below C4, which is F3, is calculated by multiplying the frequency of C4 (261.63 Hz) by 2/3, resulting in 174.42 Hz.

Explanation:

The frequency of the musical note C4 is about 261.63 Hz. A perfect fifth below a note is 7 half-steps below on the chromatic scale, which corresponds to a frequency ratio of approximately 2/3. Therefore, to find the frequency of the note that is a perfect fifth below C4, we multiply the frequency of C4 by 2/3.

Calculating this, 261.63 Hz × (2/3) = 174.42 Hz which is the note F3. Hence, the frequency of the note a perfect fifth below C4 is 174.42 Hz.

Hermosa Menendez is employed by Chemical Industries. She has a family membership in the group preferred provider organization (PPO). The annual premium is $6,180. Her employer pays 75 percent of the premium.

Answers

Answer:

a) $4635

b) $1545

c) $29.7 per week

Step-by-step explanation:

Hermosa Menendez is employed by Chemical Industries. She has a family membership in the group preferred provider organization (PPO). The annual premium is $6,180. Her employer pays 75 percent of the premium.

a) How much does the employer pay annually

b) How much does she pay annually

c) How much is deducted each week as her weekly cost

a)

Given that:

The annual premium = $6180

Employers percent = 75% = 0.75

The money the employer pays annually = Annual premium × Employers percent = $6180 × 0.75 = $4635

b)

Since the employers percent = 0.75, her percent = 1 - 0.75 = 0.25

The money that she would pay annually = Annual premium × her percent = $6180 × 0.25 = $1545

c)

There are 52 weeks in a year.

The money she would pay weekly = money that she would pay annually / 52 weeks = $1545 / 52 weeks = $29.7 per week

Answer:

A. $ 4,635

B. $ 1,545

C. $ 29.72 (Rounding to the next cent)

Correct statement and questions:

Hermosa Menendez is employed by Chemical Industries. She has a family membership in the group preferred provider organization (PPO). The annual premium is $6,180. Her employer pays 75 percent of the premium.

a) How much does the employer pay annually

b) How much does she pay annually

c) How much is deducted each week as her weekly cost

Source:

Previous question that can be found at brainly

Step-by-step explanation:

A. The employer will pay annually the 75% of the annual premium:

6,180 * 0.75 = $ 4,635

B. Hermosa will pay annually the difference:

6,180 - 4,635 = $ 1,545

C. Hermosa will pay weekly:

1,545/52 = $ 29.72 (Rounding to the next cent)

The ratio of boys to girls in Ms.cunninghams class is 2 to 3. There are 18 girls in the class what is the total number in ms.cunninghams class?

Answers

Answer:

30 students

Step-by-step explanation:

18/3 = 6

6 x 2 = 12 boys

12 boys + 18 girls = 30 students

- Hope this helps! Please let me know if you would like a further explanation.

how do you do surface area? and this question

Answers

Answer:

you take all the point from around then multiply and do the same with the base

Step-by-step explanation:

take 2 times 2.812 times 44 times 4add them all
You would have to multiply 2x2.8, 12x4 and 4x4 after this you add them together which I think equals 69.6

A fish tank contains as many goldfish as mollies, and there are 6 more guppies than goldfish. If the total combined number of fish in the tank is 22, how many mollies are in the tank?

Answers

Answer:

8 mollies

Step-by-step explanation:

22-6=16

16/2=8 mollies

Answer:

5

Step-by-step explanation:

how would adding the score zero to this data affect the mean and median game scores

Answers

Answer:

The mean and median will change.

Step-by-step explanation:

Mean takes the sum of all the numbers and divide by the amount of numbers there are. This would add 1 to the denominator, which would decrease the total mean score, as the numerator does not change.

The Median will also change. The median is found by finding the middle number of the set. Adding 0 to the set would result in a different number being chose for the median.

~

Use the system of equations to answer the questions.

2x + 3y = 3

y = 8 – 3x

The value of y from the second equation is substituted back into the first equation. What is the resulting equation?
2(8 – 3x) + 3x = 3
2x + 3(8 – 3x) = 3
2x + 3y = 8 – 3x

What is the value of x?
–3
–1
3

What is the value of y?
–1
1
3

Answers

Answer:

2x + 3(8 - 3x) = 3

x = 3

y = -1

Step-by-step explanation:

2x + 3y = 3

y = 8 – 3x

2x + 3(8 - 3x) = 3

2x + 24 - 9x = 3

7x = 21

x = 3

y = 8 - 3(3)

y = -1

Answer:

✔ 2x + 3(8 – 3x) = 3

What is the value of x?

✔ 3

What is the value of y?

✔ –1

mark me brainiest plz thank you

Step-by-step explanation:

Sue bought 54 ft of lumber for building a window frame each window frame requires 13 1/2 feet of lumber how many window frames how many window frames can she make

Answers

Answer:

The correct answer is 4 window frames.

Step-by-step explanation:

Sue bought 54 feet of lumber for building window frame.

Each window frame requires 13 1/2 feet = [tex]\frac{27}{2}[/tex] feet of lumber.

Therefore the number of window frames Sue can make with 54 feet of lumbers she bought is given by dividing the total amount of lumber she has by the lumber it takes to make a single window frame.

= [tex]\frac{54}{27}[/tex] × 2 = 2 × 2 = 4

Thus Sue can make 4 window pane from 54 feet of lumber, each of 13 and a half feet.

Sue can make 4 window frames with the 54 feet of lumber she purchased, as each frame requires 13.5 feet.

Sue bought 54 feet of lumber to build window frames, with each window frame requiring 13.5 feet of lumber. To determine how many window frames Sue can make, we divide the total amount of lumber by the amount required for one frame.

Here's the calculation:

Start with the total amount of lumber: 54 feet.

Divide this by the amount required for one window frame: 13.5 feet.

Perform the division: 54 / 13.5 = 4.

Sue can make 4 window frames with the lumber she has purchased.

The velocity function for a particle is v(t) = 2t - 5 ft/sec. Find the displacement for the particle from t = 0 to t = 4 sec. (Give answer with units)

Answers

Answer: The displacement is -4 ft.

Step-by-step explanation:

The velocity is:

v(t) = 2t - 5ft/s

If we want to find the displacement between t = 0s and t = 4s, we need to find the difference between the position at t = 0s and at t= 4s

The equation for the position is obtained by integrating over time:

P(t) = (2t^2)/2 - 5*t + c

where c is the initial position, then we have:

P(t) = t^2 - 5t

P(4) - P(0) = 4*4 - 5*4 - 0 = 16 - 20 = -4

The total displacement is -4 feet

Answer:

Displacement, d = - 4ft

Step-by-step explanation:

Given,

The velocity function for a particle v(t) = 2t - 5 ft/sec.

To obtain the displacement for the particle from t = 0 to t = 4 sec

We integrate v(t) with respect to t

: Displacement, d = ∫₀⁴ ( 2t - 5) dt

= t² - 5t |₀⁴ = (4² - 5(4)) - 0² - 5(0)

=16 - 20 = - 4ft

2- En una habitación cuadrada de 4 m de lado se coloca una alfombra circular de 3 m de diámetro. ¿Cuál es la superficie cubierta por la alfombra? ¿Cuál es la superficie del cuarto no cubierto por la alfombra

Answers

Answer:

7.065 m ^ 2

8.935 m ^ 2

Step-by-step explanation:

The first thing is to calculate the surface of each one, that is, the area

For the room that is square, each side measures 4m, therefore:

As = 4 * 4 = 16 m ^ 2

The area of the carpet is that of a circle, that its area is the number pi times the radius squared, we know that the radius is half the diameter, therefore r = 3/2 = 1.5 m

replacing in the area formula

Ac = pi * r ^ 2 = 3.14 * 1.5 ^ 2

Ac = 7.065 m ^ 2

In other words, the area covered by the carpet is 7,065 m ^ 2 and the area not covered would be the subtraction between the area of the room minus the area of the carpet, that is:

16 m ^ 2 - 7.065 m ^ 2 = 8.935 m ^ 2

8.935 m ^ 2 would be the area that the carpet does not subside.

what is the hardest math question

Answers

Answer:

Goldbach’s Conjecture precipitated from letters in 1742 between German mathematician Christian Goldbach and legendary Swiss mathematician Leonhard Euler, considered one of the greatest in math history. As Euler put it, “I regard [it] as a completely certain theorem, although I cannot prove it.”

Euler may have sensed what makes this problem counterintuitively hard to solve. When you look at larger numbers, they have more ways of being written as sums of primes, not less. Like how 3+5 is the only way to break 8 into two primes, but 42 can broken into 5+37, 11+31, 13+29, and 19+23. So it feels like Goldbach’s Conjecture is an understatement for very large numbers.

Still, a proof of the conjecture for all numbers eludes mathematicians to this day. It stands as one of the oldest open questions in all of math.

Answer:

dividing and multiplying decimals

Step-by-step explanation:

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