Uma pessoa com audição normal pode ouvir sons de frequências entre 20 Hz e 20000 Hz. As frequências das ondas de rádio ficam entre 3000 Hz a 300 GHz. (1 GHz = 1000000000 Hz). Se 10000 Hz, por exemplo, é uma frequência audível, por que as pessoas não ouvem as ondas de rádio que estão viajando no espaço que rodeia?

Answers

Answer 1

Answer:

........,..................y.....bhjkkbub


Related Questions

Which of the points shown below are on the line given by the equation y = 3x? Check all that apply. ​

Answers

Answer:

Step-by-step explanation:

Only A and D.  Draw a line through A and D and you will see that this is a proportional relationship; the line goes through the origin.

plsss help me ASAP !!! you get to win brainlist

Answers

Answer:

122 employees

Step-by-step explanation:

So, first you have to find 22% OF 100 WHICH IS 22. (100x0.22= 22) Then, since they have to lay off 22% more people you add the 22% of 100 (22) to the 100. (100+22=122) This means that they have laid off 122 employees this year. I hope this helps!

Wendy was asked to write an equation and solve this problem. Dylan bought a box of markers. He used 14 markers and had 18 that he didn’t use. How many markers were in the box? Wendy’s work is shown below. Steps Wendy’s Work Step 1 m minus 14 = 18 Step 2 m minus 14 minus 14 = 18 minus 14 Step 3 m = 4 In which step, if any, did Wendy first make a mistake in her work? step 1 step 2 step 3 no mistake

Answers

Answer: STEP 2

Step-by-step explanation: I took the quiz i am pretty positive

plz mark me as the brainliest

Answer:

step 2 or b

Step-by-step explanation:

Of all 840 sixth grade students in a math school, 700 participated in the math Olympiad. Of all 910 fifth grade students, 745 participated in it.From which grade did more students participate in the Olympiad?

Answers

Answer:Sixth grade

Step-by-step explanation:

Given

There are [tex]840[/tex] sixth grade students out of which [tex]700[/tex] Participated in math olympiad

also no of fifth grade students[tex]=910[/tex]

Fifth graders who participated in math olympiad [tex]=745[/tex]

Since [tex]745>740[/tex]

There are more fifth graders in Olympiad [Numerically]

Percentage wise

Percenteage of sixth graders who participated in Math olympiad[tex]=\dfrac{700}{840}\times 100=83.33\ \%[/tex]

Percenteage of Fifth graders who participated in Math olympiad[tex]=\dfrac{745}{910}\times 100=81.86\ \%[/tex]

So, a greater Population of Sixth graders participated in math olympiad compared to Fifth graders as [tex]83.33\ \%>81.86\ \%[/tex]

An object is launched at 9.8 meters per second from a 73.5 meter tall platform. The object’s
height s (in meters) after t seconds is given by the equation s(t) = −4. 9t2 − 9. 8t + 73. 5. When
does the object strike the ground?
a. How can you solve this using a Table of Values?
b. How can you solve this using a graph?
c. How can you solve this algebraically?

Answers

Answer:

b

Step-by-step explanation:

PLS HURRY I NEED THIS ANSWERED RIGHT NOW!!! Brittney has twice as much money as Sun. Together, they have $60. Let x represent the amount of money Sun has. What expression represents the amount of money Brittney has? What expression represents the amount of money that Brittney and Sun have together? What is the equation described in this problem?

Answers

Sun's money = x

Brittney's money = 2x

x + 2x = $60

3x = $60

3x/3 = 60/3

x = 20

So amount that Brittney has is 2x.

The amount they have together is 3x

The equation that describes the problem is 3x = $60

Answer:

Brittney has twice as much money as Sun. Together, they have $60. Let x represent the amount of money Sun has.

What expression represents the amount of money Brittney has?

✔ 2x

What expression represents the amount of money that Brittney and Sun have together?

✔ 2x + x

What is the equation described in this problem?

✔ 2x + x = 60

         

Step-by-step explanation:

Based on the above table, what is the fastest growing listed occupation for those without a college degree?
a. Gaming and sports book writers and runners
b. Dental assistants
C. Marriage and family therapists
Manicurists and pedicurists
d.

Answers

Answer:

Step-by-step explanation:

Dental assistants

Answer:

Dental assistants

Step-by-step explanation:

There are ten kids in a class. When any two meet, they shake their hands.Before the class starts, how many handshakes are there?

Answers

Answer: 45 handshakes.

Step-by-step explanation:

We have 10 kids.

Let's count.

Kid 1, can meet other 9 kids, so here we have 9 handshakes.

Kid 2, he can meet other 9 kids, but he already handshaked kid 1, so here we only count 8 handshakes.

Kid 3, he can meet other 9 kids, but we already counted the handshake with kid 1 and kid 2, so from here we only count 7 handshakes.

You can see the pattern, the total number of handshakes will be:

H = 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1  = 45

Answer:

45 handshakes

Step-by-step explanation:

OMG, I'm so confused. Help me pls!
1.) -9u( -4)(-w)
2.) -b(-12)(11)
3.) -h(-jk)
4.) (-1)(-a)(-bc)

Answers

2. Is the best choice

Answer:

-36uw

132b

hjk

-abc

Step-by-step explanation:

When you multiply a negative by another negative, the negative is cancelled out.  When you multiply a negative by a positive, the negative is kept.

1.) -9u(-4)(-w)

36u(-w)

-36uw

2.) -b(-12)(11)

12b(11)

132b

3.) -h(-jk)

hjk

4.) -1(-a)(-bc)

1a(-bc)

-1abc

-abc

Hope this helps! :)

45 over 43 as a percent

Answers

Answer: 104.65%

Step-by-step explanation: 45/43=1.0465 so you just move the decimal to the right 2 places to make it a percent. It’s over 100% because 45 is higher than the total of 43.

Which expression is the best estimate of Four-fifths times 22.01?

One-fifth times 20
Four-fifths times 20
4 × 20
5 × 20

Answers

Answer:

the second one four fifth times 20

Step-by-step explanation:

4/5×22.01=17.68 which is approximately equal with 4/5×20=16.

Answer:

Its four fifths times 20 i took the test.

Step-by-step explanation:

1.
2.
3.
Sarah earns €8 per hour working in the local shop. How much does she get paid for working 2 3 hours?

Answers

2 hours she earns €16
3 hours she earns €24

Answer:

If it says working for 23hrs then the answer is €204

Step-by-step explanation:

8×23=204

Which expression is the best estimate of Four-fifths times 22.01?

One-fifth times 20
Four-fifths times 20
4 × 20
5 × 20
Please awnserill give brainliest

Answers

Answer:

four fifth times 20

Step-by-step explanation:

17.60=16

Determine which consecutive integers do not have a real zero of f(x) = x3 + 5x2 - x - 6 between them.
a.(-6,-5)
c. (-2, -1)
b. (-5, 4)
d. (1,2)

Answers

Answer:

A

Step-by-step explanation:

I took the test, the answer is A, not c

An angle measuring 32 degrees has a complement that measures ( 2x-16 ) degrees. What is the value

Answers

Answer:

x=37

Step-by-step explanation:

Complementary angles add up to 90 degrees.

Let's first find the measure of the complement.

90-32=58

Now we can set the numerical value of it equal to the expression it gave us.

2x-16=58

We have to isolate x.

Lets add 16 to both sides

2x=74

Divide both sides by 2.

x=37

splitting the middle term 2x^2-9x+4

Answers

(2x-1)(x-4)
Hereeeeeeeee

A university's freshman class has 1000 students. 600 of those students are majoring in Engineering. What percentage of the freshman class are Engineering majors?

Answers

Answer:60%

Step-by-step explanation:

If there are 1000 students in total and 600 are majoring in engineering, you divide 600 by 1000 to find the percent of students majoring in engineering. (600/1000) =.6

To turn a decimal into a percent you move the decimal over 2 places making it 60%.

Answer: 600/1000 = .6 that is the answer

or 60% when you turn the decimal to percent

Step-by-step explanation:

answer quick for brainliest!

Answers

Answer:

b

Step-by-step explanation:

Answer:

A

Step-by-step explanation:

if y=5-x then ...

a would be y=5-1 = 4

b would be y=5-2 =3

c would be y=5-4 =1

d would be y=5-3 =2

a is the right answer because (1,4) 1= x and y= 4 and 5-1=4

Solve for x:

-0.6x > 3

A. X < -5

B X < -0.2

C X > -5

D. X > -0.2
I don’t need an explanation just the answer thank you

Answers

Answer:

A

Step-by-step explanation:

Given

- 0.6x > 3

Divide both sides by - 0.6, reversing the symbol as a result of dividing by a negative quantity, thus

x < - 5 → A

there are men and women at a meting 42 are women. 40 % are men work out the total number of people at the meeting

Answers

Answer:

There are therefore 60% women there so altogether there are 70 people at the meeting

11.) What was the average heart rate after exercise for trial 3? *

A. 148 b/m
B. 146 b/m
C. 140 b/m
D. 144 b/m
#12.) Explain the general relationship between exercise and heart rates in humans. *

A. as exercise levels increase, heart rate decreases
B. as exercise levels increase, heart rate increases
C. as exercise levels increase, heart rate remains the same
#13.) All of the following are important functions of blood in the human body except: *

A. supplying oxygen to cells/tissues
B. making the body immune by circulating white blood cells
C. sending signals to the brain in response to internal/external stimuli
D. transporting wastes away from cells
#14.) Where does the exchange of food, oxygen, and wastes occur? *

A. arteries
B. capillaries
C. veins
D. lymph vessels
Base your answer to question fifteen on the diagram below and your knowledge of science. The diagram represents a human organ system. The arrows show the directions of blood flow. Letters A and B represent locations in the system.

#15.) State one reason why blood at location B contains more oxygen than blood located at location A. *

Answers

Answer:

11) D. 144 b/m

12) B. As exercise levels increase, heart rate increases

13) D. Transporting wastes away from cells

14) B. Capillaries

15) This is because during excercise you increase the skin blood flow in order to enable ¨heat dissipation¨. Then after the increase in blood flow to the muscles decides to have an increase which causes it to have a cardiac output which is in direct proportion to the increase in oxygen consumption.

Step-by-step explanation:

Solve the following equation 5x+3/4 - 2x-4/3=5​

Answers

Answer: X= 67/36

Step-by-step explanation:

On an exam you get 2 points for each question answered correctly, zero points for each question left blank, and lose one point for each question answered incorrectly. What is your total score on the exam if you answer 22 questions correctly, leave 7 questions blank, and answer 5 questions incorrectly? (work please)

Answers

Answer:

39 points.

Step-by-step explanation:

Correct questions: 22*2=44

Blank questions: 7*0=0

Incorrect questions: -1*5=-5

Add all the points up and you get:

44+0-5=

44-5=

39 points

the differce of a number and twenty four is equal to forty six​

Answers

Answer:

n - 24 = 46

Step-by-step explanation:

Answer:

It is 70 because when you add 24 and 46 it is 70

so when you subtract 24 from 70, you get 46

:)

Step-by-step explanation:

while hiking you see a 100ft observation tower on top of a 1100ft hill. The angle of elevation to the top of the tower is 6. How far away is the tower?.​

Answers

Answer:692.82 ft

Step-by-step explanation:

Given

Height of tower is [tex]h=100\ ft[/tex]

Tower is mounted at the top of [tex]H=1100\ ft[/tex] hill

angle of elevation [tex]\theta =60^{\circ}[/tex]

Using figure we can write

[tex]\tan \theta =\dfrac{h+H}{\text{Distance}}[/tex]

[tex]\tan 60^{\circ}=\dfrac{100+1100}{\text{Distance}}[/tex]

[tex]Distance =\frac{1200}{\tan 60^{\circ}}[/tex]

[tex]Distance=\frac{1200}{\sqrt{3}}[/tex]

[tex]Distance=692.82\ ft[/tex]

solve similar triangles

Answers

y=27.5 is the answer

Answer:

22.5

Step-by-step explanation:

With similar triangles you don't have to solve for any angle, as both triangles are alike, just different sizes in the case. So 20/12 = 5/3 or 1.66, and the same for 27.5/16.5, so using that, we have 37.5/1.66 which is 22.5

What is a correct name for the angle shown? Line segments R S and S T combine to form an angle. Angle R Angle S Angle R T S Angle S R T

Answers

Answer:

(B)Angle S

Step-by-step explanation:

Given that line segments RS and ST combine to form an angle.

The angle formed by the two line segments occur at the common end point of the two segments which in this case is S.

Therefore the angle is formed at S.

This can be written in the following ways:

[tex]\angle RST, \angle TSR$ or simply \angle S.[/tex]

The correct option is B.

Answer:

What is a correct name for the angle shown? Option B

(A) Angle R

( B) Angle S   <====== Option B  Hope this helps

(C) Angle R T S

(D) Angle S R T

Step-by-step explanation:

You flip a coin and then roll a fair six-sided die. The coin lands heads-up and the die shows an even number.

please show work thanks!

Answers

Answer:

1/4 = 25%

Step-by-step explanation:

The probability of heads is 1/2.

The probability of an even number on a die is 3/6 = 1/2.

The probability of both is (1/2) (1/2) = 1/4, or 25%.

Answer:

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Step-by-step explanation:

A "fair" coin lands heads-up half of the time and "tails-up" half of the time.

For one flip, the probability of landing heads-up is 1/2.

Of those successes, we now consider the probability of the "fair" die landing with an even number on top. This probability is (number of successes) / (total number of possibilities) = 3/6, or 1/2.

So, the probability of both events happening ("and") is 1/2 of 1/2, or (1/2)*(1/2) = 1/4.

Use conversions to solve the problem. Jane wants to edge her garden with stone. All sides are equal. The stone costs ​$6 per yard. What is the perimeter of the​ garden? How much will it cost to buy the edging she ​needs?

Answers

Answer:

Perimeter: [tex]p = 4\cdot l[/tex], Total costs: [tex]C = 24\cdot l[/tex]

Step-by-step explanation:

The garden has a square form. Let be [tex]l[/tex] the length of any of the sides, measured in yards. The perimeter of the garden, measured in yards, is:

[tex]p = 4\cdot l[/tex]

Now, perimeter has a length unit and total costs of edging the garden, measured in US dollar, is:

[tex]C = \left(6\,\frac{USD}{yard} \right)\cdot 4\cdot l[/tex]

[tex]C = 24\cdot l[/tex]

-6 + m = -23
I need work and answer
Will give the bainliest

Answers

Answer:

The answer for [tex]m[/tex] :

[tex]m = -17[/tex]

Step-by-step explanation:

Solve for [tex]m[/tex] :

[tex]-6 + m = -23[/tex]

Add both sides by 6:

[tex]-6 + 6 + m = -23 + 6[/tex]

[tex]m = -17[/tex]

So, the answer is [tex]x = -17[/tex]

Other Questions
Find an ordered pair (x, y) that is a solution to the equation2x-y=4 The postal service sorts mail as Priority Mail Express, Priority Mail, First-Class Mail, or Standard Mail. Over a period of 3 weeks, 18 of each type were mailed from the Network Distribution Center in Atlanta, Georgia, to Des Moines, Iowa. The total delivery time in days was recorded. Minitab was used to perform the ANOVA. The results follow: Source DF SS MS F P Factor 3 1.30 0.43 1.79 0.157 Error 68 16.45 0.24 Total 71 17.75 Level N Mean StDev Priority Mail Express 18 2.965 0.345 Priority Mail 18 3.044 0.631 First-Class Mail 18 3.296 0.578 Standard Mail 18 3.231 0.341 Using the ANOVA results, compare the average delivery times of the four different types of mail. In tragedy, the main character(s) experiences a downfall. Think about the characterization of Romeo and Juliet in Act II. What do you think could cause their downfall? Although this trait causes tragedy, how might it also be admired? How can you check your answer?Multiply 3 by 3, then add 7 and make surethe answer is 21.Multiply 3 by 3, then add 7 and make surethe answer is 24.Multiply 7 by 3, then add 3 and make surethe answer is 21.Multiply 7 by 3. then add 3 and make surethe answer is 24.DONE Which of the points shown below are on the line given by the equation y = 3x? Check all that apply. What is the opposite of -(-23) -6 + m = -23I need work and answerWill give the bainliest What is Georges pint of view from mice and the men According to Adams , what was life like for freed men and women after the civil war Solve for x:-0.6x > 3A. X < -5B X < -0.2C X > -5D. X > -0.2I dont need an explanation just the answer thank you VERY IMPORTANT I NEED HELP!!! What is the following quotient?/96^2.32/2212 Put the following rational numbers in order from greatest to least.a. -0.4, -1/4, 4.0 x 10^-3, 40%b. -1/4, -0.4, 40%, 4.0 x 10^-3c. 40%, 4.0 x 10^-3, -1/4, -0.4d. 4.0 x 10^-3, 40%, -0.4, -1/4 Call Systems Company, a telephone service and supply company, has just completed its fourth year of operations. The direct write-off method of recording bad debt expense has been used during the entire period. Because of substantial increases in sales volume and the amount of uncollectible accounts, the company is considering changing to the allowance method. Information is requested as to the effect that an annual provision of 1% of sales would have had on the amount of bad debt expense reported for each of the past four years. It is also considered desirable to know what the balance of Allowance for Doubtful Accounts would have been at the end of each year. The following data have been obtained from the accounts:Year Sales Uncollectible Accounts Written Off receivable written 1st $ 900,000 $4,500 $4,500 2nd 1,250,000 9,600 3,000 $6,600 3rd 1,500,000 12,800 1,000 3,700 $8,100 4th 2,200,000 16,550 1,500 4,300 $10,750Required:1. Assemble the desired data to prepare a schedule of bad debt expense. Enter all amounts as positive numbers. in the space provided, complete the sentence by placing appropriate indefinite pronouns in each blank.Suzy loves to bake cookies for her family. _________ loves them, but _______ helps her clean up. What state has the longest coast need that answer asap!!! Two trains leave a station on different tracks. Thetracks make an angle of 115 with the station as avertex. The first train travels 200 kilometers andmakes its first stop in Pocomoc, while the secondtrain travels 350 kilometers and makes it first stopin Easton, How far apart are the trains when bothare at their first stop? Round the answer to thenearest tenth221,666.6 km188.7 km470.8 km360.6 km splitting the middle term 2x^2-9x+4 What is the answer to this question Liberal ideals, expressed in politics, had a strong impact in the creation of new social experiences that materialized in the creation of new republics worldwide. Accordingly, the states mainly sought to defend: I) The rescue of the foundations of popular sovereignty. II) The separation of the powers of the state in the Republic. III) The existence of a marked society of privileges. A) I only B) II only C) I and II D) II and III E) I, II and III