__is the ratio of net production from a lower to a higher trophic level. A) Retrogressive efficiency B) Trophic level efficiency C) Progresive efficiency D) Conversion efficiency E) Conversion inefficiency​

Answers

Answer 1

Answer: B

did a small amount of research and this was the only answer that popped up under my searches.


Related Questions

What rights does a state have with respect to its borders?

Answers

Answer:

A state is understood to be the political institution that administers a certain territory, establishing applicable laws in it, managing its resources and regulating the life in society of its citizens, who are the inhabitants of the territory. States have sovereignty as their main right, which is the ability of state to have exclusive legal self-determination. This self-determination ability is characterized by the autonomy and independence of the nation; In political science, it is understood as the property of an institution to be the sole starting point for all state power within a political framework.

Please answer these questions.

1. What is a wind vane?
2. Types of wind vane.
3. Uses of wind vane.
4. Advantages of wind vane.
5. Disadvantages of wind vane.
6.What does a wind vane measure on how does it measure it.
7. Is there any modification for a wind vane? if there is, state it.
8. If possible attach an image of a wind vane.
9. Any other important information I may need to know about a wind vane​

Answers

Answer:

1.nstrument used for showing the direction of the wind. It is typically used as an architectural ornament to the highest point of a building.

other:

A wind vane (also known as a weathervane) is an instrument that tells you the wind direction. Specifically, a wind vane lets you know what direction the wind is coming from. 

2. 3. There are three primary types of wind vanes: the classic weathervane, wind sock, and digital wind vane.

Weathervane – In use for centuries, these are the type often seen on top of barns, cathedrals, and a variety of other buildings. Since weathervanes are also used for decorative purposes (in addition to functional applications), they can take on a variety8 of shapes and styles. The classic style features a fin in the shape of a rooster, but a variety of other fin shapes can be featured.

you’ll see situated four horizontal posts that read “N,” “S,” “E,” and “W” (north, south, east, and west) to help the viewer determine the wind direction.

.

Wind Sock – This type of wind vane is primarily seen in airports, near runways. While a wind sock determines the wind direction, it generally does not indicate a north/south/east/west direction. However, based on how much the sock is inflated, the viewer can estimate the strength of the wind.

This is helpful because, for example, a pilot needs to know the wind direction and strength to help him or her adjust for the wind when landing or taking off. A wind sock can also be beneficial at a golf course, marina, baseball field, or any other location where knowing the wind direction and strength is useful when participating in an activity.

Digital Wind Vane – A digital wind vane shares many basic design elements with a classic weathervane, but is significantly more sophisticated. Quite often, a digital wind vane is seen as a component of a weather station, which will also measure conditions such as wind speed, temperature, humidity, barometric pressure, and sometimes rainfall.

A digital wind vane will either hang from a weather station sensor’s underside, or sit atop a pole or housing of some sort, and rotate on a spindle. At the end of the spindle will usually be an optical sensor that allows a digital processor to know the wind direction, typically up to 16 positions. The reading is sent to a digital display where the wind direction is shown on a circular graphic called a wind rose. Oftentimes, the wind rose will show (in the form of arrows) the current wind direction, as well as the previous two readings.

4.A wind vane can provide a variety of uses. These can include enhanced enjoyment of a recreational activity, safety, protection of property, and the general enjoyment of weather observation.

Safety – Wind conditions play a significant role during severe weather events. If there is a storm in your area, a wind vane can help you determine if it is moving toward you or away from you. Having this information can give you extra time to take action and get your loved ones to a safe location.

Protection of Property – Another advantage of knowing the wind direction during a storm is the ability to determine if your personal property may be in harm’s way. This can offer a chance to make preparations to your home, automobile, yard, and more in an effort to eliminate damage.

Boating, Remote Control Aircraft, Golf, Etc. – Knowing the direction of the wind can help you fine tune a tee shot down a long fairway or adjust the angle of a sail boat. If an activity is affected by the wind, chances are knowing the wind direction can be helpful.

Storm Spotting and Chasing – Storm spotters and chasers work with organizations like the National Weather Service and SKYWARN to provide vital, real-time information during severe weather events. This helps local authorities keep their communities safe. Since the direction a storm is traveling is vitally important to a chaser or spotter’s report, knowing the wind direction is a key piece of information.

Watching the Weather – Weather buffs truly enjoy keeping tabs on weather conditions, just for the fun of it. Having a weather vane provides another key data point, integral to weather observation.

5. The disadvantage is wind vane is not

accurate and unreliable at the time, does

not show the speed of the wind, and

depends on winds breezes and thus is

unable to tell the high pressure and low

pressure in the region.

6. Wind has both speed and direction. Anemometers measure wind speed and wind vanes measure wind direction. (digital)

A typical wind vane has a pointer in front and fins in back. When the wind is blowing, the wind vane points into the wind.  (classic)

7. may be the modified wind vane is the digital one which has many features mentioned in previous question.

9. no i think ( :

(50 POINTS & BRAINLIEST) Find a country in either the Balkans or the Caucasus mountains, explain what other features prevent their language from spreading outward - then find an OUTLYING EXAMPLE, of another place in the world where that particular language is spoken. And tell me why it happened.

Answers

Answer:

is it free writing or outta a form?

Explanation:

answer key to intro class for james madison high school quizzes

Answers

It is on Quizizz if you see

read the following passage from the war prayer

how does twain use a rhetorical device to support his purpose in this passage?
plssssssssss helppppp

Answers

Answer: d

Explanation:

Answer:

it's d

Explanation:

i just did this

I WILL GIVE BRAINLIEST WHOEVER ANSWERS FIRST!!! (IM TIMED SO PLS HURRY)
Read the writing prompt for an argumentative essay.

The Roman Empire had a lasting impact. Which contributions from that era affect the way humans live today? Write an essay that argues your viewpoint on this topic. Support your claim with reasons and evidence.

Which research question would be most effective in addressing the prompt?

What factors led to the collapse of the Roman Empire?
What type of leaders held power in the Roman Empire?
What were the geographic borders of the Roman Empire?
What elements of modern society began in the Roman Empire?

Answers

Answer:

well. I can give you how they fell honestly i dont have the time to write a whole essay for you but i can give you a paragraph on how they fell :)

The way by which the Roman Empire fell or declined is still debated by scholars today. A theory was introduced by Edward Gibbon that stated that instead of Rome falling, it declined.  In the fifth century Rome became too big for its own good. Other barbarians and powers began to seize control over roman territory. There were also great power struggles in deciding which city should have more power. These quarrels left them blind to things threatening their society bot physically and socially. Their military became more barbaric, less uniform and efficient. The Romans also began to separate from others by language and beliefs. Thus, the Romans collapsed in on themselves.

(100 POINTS & BRAINLIEST) Find a country in either the Balkans or the Caucasus mountains, explain what other features prevent their language from spreading outward - then find an OUTLYING EXAMPLE, of another place in the world where that particular language is spoken. And tell me why it happened.

Answers

Greece’s language prevent them from spreading because, their language are similar to other languages, due to the people stealing it from them. People in Turkey speak Greek solely because, muslims in Turkey who were ethnic Greek and spoke Greek had to go to Turkey. So, after that they most people passed the language to their kids and so forth.


~I hope I’m not too late!

A deck of playing cards has 52 cards, of which 13 are diamonds. If you shuffle the deck well and turn over the top 4 cards, one after the other, what's the probability that all 4 are diamonds?

Answers

Answer:

The correct solution is "0.002". A further solution is given below.

Explanation:

The given values are:

The total number of playing cards,

= 52 cards

Total number of diamonds,

= 13

Now,

The probability of top four cards will be:

= [tex]P(First \ diamond)\times P(Second \ diamond)\times P(Third \ diamond)\times P(Fourth \ diamond)[/tex]On putting the values, we get

= [tex]\frac{13}{52}\times \frac{12}{51}\times \frac{11}{50}\times \frac{10}{49}[/tex]

= [tex]0.25\times 0.23\times 0.22\times 0.20[/tex]

= [tex]0.002[/tex]

How did the Gunpowder made the empires of Europe, Africa and Asia increase their influence?

Answers

Answer:

The gunpowder was invented in the 1200s by the Chinese, who mixed potassium nitrate with carbon and sulfur to generate a substance that would function as the main detonating explosive in firearms. From this invention, the most important nations of each continent that managed to dominate this new technology increased their military capacity compared to the other nations, which instead maintained the old military systems and weapons, such as swords, bows and arrows, etc. In this way, nations like the Ottomans in the Middle East began to use this technology to expand their areas of influence and defeat their enemies.

Answer:

Gunpowder Empires or Islamic Gunpowder Empires refers to the Ottoman, Safavid and Mughal empires as they flourished from the 16th century to the 18th century. These three empires were among the strongest and most stable economies of the early modern period, leading to commercial expansion, and greater patronage of culture, while their political and legal institutions were consolidated with an increasing degree of centralisation. The empires underwent a significant increase in per capita income and population, and a sustained pace of technological innovation. They stretched from Central Europe and North Africa in the west to between today's modern Bangladesh and Myanmar in the east.

hope it's helpful

thank you

And please follow me

This assignment is due is half an hour and I'm really lost

Answers

Answer:

[tex]3B - 4C = \left[\begin{array}{cc}-8 &-23\\1&-15\end{array}\right][/tex]

Explanation:

Given

[tex]B = \left[\begin{array}{cc}8&-5\\-1&3\end{array}\right][/tex]

[tex]C = \left[\begin{array}{cc}8&2\\-1&6\end{array}\right][/tex]

Required

Determine 3B - 4C

If

[tex]B = \left[\begin{array}{cc}8&-5\\-1&3\end{array}\right][/tex]

Then

[tex]3B = 3 * \left[\begin{array}{cc}8&-5\\-1&3\end{array}\right][/tex]

[tex]3B = \left[\begin{array}{cc}24&-15\\-3&9\end{array}\right][/tex]

Similarly,

If

[tex]C = \left[\begin{array}{cc}8&2\\-1&6\end{array}\right][/tex]

Then

[tex]4C = 4 * \left[\begin{array}{cc}8&2\\-1&6\end{array}\right][/tex]

[tex]4C = \left[\begin{array}{cc}32&8\\-4&24\end{array}\right][/tex]

So:

[tex]3B - 4C = \left[\begin{array}{cc}24&-15\\-3&9\end{array}\right] - \left[\begin{array}{cc}32&8\\-4&24\end{array}\right][/tex]

This gives:

[tex]3B - 4C = \left[\begin{array}{cc}24 - 32 &-15-8\\-3-(-4)&9-24\end{array}\right][/tex]

[tex]3B - 4C = \left[\begin{array}{cc}-8 &-23\\1&-15\end{array}\right][/tex]

Connor is driving on a long road trip. He currently has 9 gallons of gas in his car. Each hour that he drives, his car uses up 2 gallons of gas. How much gas would be in the tank after driving for 3 hours? How much gas would be left after t hours?

Answers

Answer:

1. 3

2. y=9-2x

Explanation:

How did religious conflicts and new religions influence in Africa?

Answers

Answer:

All religions have their accepted dogma, or articles of belief, that followers must accept without question. This can lead to inflexibility and intolerance in the face of other beliefs. ... Religious extremists can contribute to conflict escalation. They see radical measures as necessary to fulfilling God's wishes

Explanation:

hope this helps!! :D

Respond to parts 1 and 2 below.

What kinds of theories or assumptions did Carl Rogers make about people?
According to Rogers, what three conditions are required in order for people to grow?

Answers

Answer:

Rogers believed growth-promoting climate required three conditions – genuineness, acceptance, and empathy.

Explanation:

Answer:

Carl Rogers personality theory is a set of principles and needs  that define how someone sets beliefs and perceptions about themselves. The principles and needs include physiological, safety, love/belonging, esteem, and self-actualization, which are all needs that need to be met. His theory explains that the more consistent or congruent our self-image and our ideal-self are with each other the better our sense of self-worth. 

People must meet three conditions, according to Rogers, in order to grow. The three characteristics that contribute to a growth-promoting environment in which people can progress include 1; congruence, meaning authenticity and truthfulness, 2; unconditional positive regard and sincerity, meaning acceptance and compassion, and 3; accurate empathic comprehension, which is an ability to deeply grasp the subjective world of another person. 

Explanation:

I know Im extremely late but this is for people in the future lol ;) ****please don't word for word it!****

The costumes of the people in the procession are the result of synthesis between religion and ethnicity that

A. Preserves a single old tradition and perpetuates colonialism
B. Creates new cultural forms and contributes to a sense of place
C shows a process of assimilation and the loss of culture
D. Are signs of centripetal forces that promote patriotism
E are indicators of centrifugal forces that can lead to conflict

Answers

Answer: B. Creates new cultural forms and contributes to a sense of place

Explanation: its correct

The random variable X is normally distributed with mean 5 and standard deviation 25. The random variable Y is defined by Y = 2 + 4X. What are the mean and the standard deviation of Y ?

Answers

Answer:

The correct answer is "100".

Explanation:

The given values are:

X (mean) = 5

X (standard deviation) = 25

Variance of X will be:

= [tex]25^{2}[/tex]

= [tex]625[/tex]

The solution of the part first is:

The given equation is :

[tex]Y=2+4X[/tex]

On putting the value of x in above equation we get ,

[tex]Y=2+4\times 5 \\Y=2+20\\Y=22[/tex]

So we get the mean of Y is 22

For finding the S.D of Y

[tex]Y = 2+4X\\[/tex]

So,

variance of Y= Var(2+4X)

As we know that the variance of constant is zero

So, variance (2) =0

⇒ [tex]Variance(aX) = a^2Variance(X)[/tex]

⇒ [tex]Var(4X) = 42Var(X) = 16Var(X)[/tex]

So,

⇒ [tex]Variance(Y) = Variance (2) + Variance(4X)[/tex]

We know the variance of constant is zero

So, var(2)=0

⇒ [tex]Variance(Y)= 16\times 625\\ Variance(Y)=10000[/tex]

Thus the standard deviation of Y is:

= [tex](10000)^{0.5}[/tex]

= [tex]100[/tex]

All galaxies are held together by gravity, but based on what we can see (stars, nebulae, etc.) , there shouldn’t be enough gravity to do the job. That is why scientists believe that all galaxies are partially held together by a substance called _________________________________, which we can’t see.

Answers

Answer:

Nebular

Explanation:

Answer:

The sun

Explanation:

The sun is to bright to see the stars in the morning, at night you can see the stars a little because they are the stars that are closest sum stars are far away

I'LL MARK BRANLIEST PLS HELP
Amazon choosing to make its products available only online and not opening retail stores is a __________decision *

Product Service Management
Marketing Information Management
Promotion
Channel Management

Answers

Answer:

product service management

Answer: Product Service Management

or

Marketing Information Management

Explanation:

Choose the response below that demonstrates the correct form of contraction for the words below. who is A. who’s C. whos’ B. whos D. whose

Answers

Answer:

A

Explanation:

Which of the following is a question of value?
a.
“What are the causes of autism?”
b.
“Is human cloning ethical?”
c.
“How does a car engine work?”
d.
“Should the drinking age be changed?”

Answers

Answer: b.  “Is human cloning ethical?”

Explanation:

Questions of value are asked in relation to their relative morality or ethical status.

The subject of the question is being put to the respondent in terms of whether the values they hold dear believe the subject is good or bad, ethical or unethical or simply moral or immoral.

Option B asks if Human cloning is ethical which makes it a question of value as it is asking about the ethical status of human cloning.

Answer:

B

Explanation:

Okay so A im ticked off at the fact that I can never get any help on this site B don't answer if you are gonna say something that makes no sense and C please help me....I'm begging you. What is an example of religion that has to do with sycretism? i have to make an infographic for my aphug class and I am stuck so please help me...this is all I've got so far

Answers

Answer:

Instances of religious syncretism—as, for example, Gnosticism (a religious dualistic system that incorporated elements from the Oriental mystery religions), Judaism, Christianity, and Greek religious philosophical concepts—were particularly prevalent during the Hellenistic period (c. 300 bce–c. 300 ce).

Explanation:

sorry 'bout you not getting any help on this

Which term best describes how human populations, like all populations, grow
until they reach carrying capacity?
O A. Linearly
B. Exponentially
O C. Slowly
OD. Negatively
SUBMIT

Answers

Answer:

exponentially

Explanation:

GOODLUCK :D

Can we all just freaking stop talking about politics, religion, and all that jazz for just a second so I can relax?!

that's all I'm asking for

Answers

Answer:

as long as people exist their gonna bug you one way or another

10 POINTS!!1!!!!Part A
In “How a Cat Played Robinson Crusoe,” what inference can be made about the cat?



A: She prefers living with her human family to living alone.

B: Living alone on the island changes how she feels about her human family.

C: She will continue to hunt even after she is reunited with her human family.

D: She learns to love the island more than her human family.

Answers

Answer:

She Prefers living with her human family to living alone

Explanation:

She prefers living with her human family to living alone is the inference can be made about the cat. Hence, option A is correct.

What is the story of Robinson Crusoe about?

Robinson Crusoe tells the "real narrative," which is narrated retroactively in the first person, of a young Englishman who, against the advice of his parents, sets out on a risky maritime journey. Daniel Defoe's tale is based on real-life castaways like Alexander Selkirk and contemporary travel accounts.

Robinson Crusoe's release marked the beginning of the literary genre of realistic fiction. In the late 18th and early 19th centuries, castaway books by Ambrose Evans, Penelope Aubin, and others gained enormous popularity in Europe as a result of their success generating several imitators.

Daniel Defoe's well-known book was inspired by the true story of a castaway from the 18th century, although the Robinson Crusoe island in reality is considerably different from the one described in the book.

Thus, option A is correct.

For more information about Robinson Crusoe, click here:

https://brainly.com/question/2654465

#SPJ2

WILL MARK BRANLIEST PLS HELP
A “potential customer” for Foot Locker would be men between the ages of 16-48 who enjoy playing sports. This describes which type(s) of segmentation:

Consumer Behavior & Geographics
Demographics & Psychographics
Psychographics & Geographics
Geographics & Demographics

Answers

Answer:Consumer Behavior & Geographics

Explanation:

Identify which theoretical model of bureaucracy — the Weberian model, the acquisitive model, the monopolistic model, the garbage can model — best describes the NSA in this scenario. Explain your answer.

Answers

Answer: The lack of competition and inefficiency are the two important traits.

Explanation:

A model of bureaucracy according to the monopolistic model. The lack of competition with the bureaucracy can lead to lack of efficient cost operations as they are not penalized for the inefficiency. The incentives are not given  for reducing the costs. The use of resources judiciously is recommended.

The lack of competition and inefficiency are the two important traits.

Which of the following aspects of the development of the French state are illustrated in the passage?

The autonomy of the French Catholic clergy
The strength and independence of the noble class
The establishment of the Third Estate as a political influence
The centralization of authority and an increase of the monarch’s power

Answers

Answer: I believe it is the last one so D

Explanation: this is because absolute power/monarchy in French was just coming around in the 1600s when this was written and it continued to get power powerful as it headed toward 1700

Answer:

d

Explanation:

PLZ HELP!!! WILL MARK BRAINLIEST!!
PLease read the An excerpt from: The Narrative of the Life of Frederick Douglass Chp.10 then answer the question.
Question: Identify two rhetorical strategies used within the work and provide an example of each. Next, write an assertion that is made and copy an embedded quote. Write in paragraph form.

Answers

Answer:

One rhetorical strategy Fredrick Douglas uses is parallelism; one example of him using this is when he says: "What he most dreaded, that I most desired. What he most loved, that I most hated." both of these sentences explain how they feel two different things, using opposite words. Another rhetorical strategy he uses is personification. One example of him using personification he says, "Under its influence, the tender heart became stone, and the lamblike disposition gave way to one of tiger-like fierceness." In this sentence, he beautifully personifies a heart.

Explanation:

edge 2020

this is what I put, and I even put it in grammarly and it's perfect

When dealing with brake failure, after pumping the brakes and downshifting, gradually apply the parking brake in an attempt to _____ slow your vehicle down.

Answers

Answer:  stop

Explanation:

When dealing with brake failure, after pumping the brakes and downshifting, gradually apply the parking brake in an attempt to stop/ slow your vehicle down.

To stop and then slow your vehicle down

My kitchen clock is working properly but was showing 14:02, which I know is the wrong time, when I left to walk to my friend's house for coffee. My friend's clock, which is correct, was showing 14:25 when I arrived and 15:08 when I left. I walked home at the same speed as when I went, and when I arrived home my clock was showing 15:56. I then adjusted my clock to the correct time.

Answers

Answer:

that's some good mental math :)

Explanation:

nice to know it was fixed.

The political ideology of Thatcherism is best defined as?


A: The withdrawal of Great Britain from the North Atlantic Treaty Organization (NATO)
B: A reliance on an extensive economic and an isolationist foreign policy known as the “Little England” program
C: Promotion of inflationary prices in an effort to increase unemployment
D: Economic policies of privatization of state-owned industrial enterprises, coal mines, and railroads.

Answers

Answer:

A. The withdrawal of Great Britain from the North Atlantic Treaty Organization (NATO)

Explanation:

Thatcherism is a form of named after Conservative Party leader Margaret Thatcher. The term has been used to describe the principles of the British government under Thatcher from the 1979 general election to her resignation in 1990, and continuing into the Conservative governments under John Major and David Cameron.

Other Questions
A yathc is anchored 90 feet offshore from the base of a lighthouse. The angle of elevation from the boat to the top of the lighthouse is 26 degrees. What is nearest to the hieght of the lighthouse How was production different after the Industrial Revolution than it wasbefore?A. Before the Industrial Revolution, items were produced in cities.After the Industrial Revolution, items were produced on farms.B. Before the Industrial Revolution, workers controlled the means ofproduction. After the Industrial Revolution, governmentscontrolled the means of production.C. Before the Industrial Revolution, items were produced one at atime. After the Industrial Revolution, items were mass produced.D. Before the Industrial Revolution, items were produced by factoryowners. After the Industrial Revolution, items were produced byfactory workers. I WILL GIVE BRAINLIEST What did Confederate states believe? Check all that apply. Protective tariffs should be passed. Slavery should be preserved. States should have more power than the federal government.Businesses should receive government aid. The states should give little power to the national government. Maryse bought a jacket from the store for $90.95. Shepaid a 7% sales tax when she bought the jacket. How Much was the jacket before the sales tax? if a aluminum rod was made out of solid glass instead of solid aluminum what would happen. How did the Progressives attempt to right the wrongs committed during the Gilded Age? Wilma is tiling her bathroom with tiles that measure 1 foot along each side. The bathroom is 15 feet long and 10 feet wide. She can lay 30 tiles per hour. Which of the following can be used to find the total number of hours it will take Wilma to cover the floor with tiles? Why did the ancient Romans call the Mediterranean Seaour sea? Consider the experiment of rolling two standard (six-sided) dice and taking their sum. Assume that each die lands on each of its faces equally often. We consider the outcomes of this experiment to be the ordered pairs of numbers on the dice, and the events of interest to be the different sums. (a) How many outcomes does this experiment have In The Odyssey - Teiresias, when Teiresias describes the conflicts that Odysseus will face, how do these conflicts relate to the storys theme?The conflicts describe the theme.The conflicts contrast with the theme.The conflicts reveal the theme.The conflicts hide the theme. Identify this instrument.MicroscopeRefracting telescopeReflecting telescopeRadio Telescope g Suppose you work for a publishing company and before launching a new magazine targeting fashion-oriented consumers, your boss wants to hold a meeting with perspective advertisers. Assume that annual expenditures on magazine ads in this genre are normally distributed with a mean of $316,532 and a standard deviation of $45,635. If the publisher wants to exclude companies with the smallest 2.74% in terms of annual expenditures on magazine ads from the sales meeting, what is the approximate minimum annual expenditure on magazine ads an advertiser would be required to have so that advertiser would be invited to the meeting PLEASE HELP I WILL GIVE BRAINLIEST AND MAX POINTSSelect the statement that describes the end behavior of the function A. As x approaches negative infinity, the function approaches positive infinity B. As x approaches negative infinity, the function approaches negative infinity C. As x approaches positive infinity the function approaches negative infinity D. As x approaches positive infinity, the function approaches 0 What is the measure of angle A in the triangle? Dianes salary is $32,000 per year. Her car payments total $2,880 per year. What percentage is her salary Which sentence uses commas correctly?Select one:1Although, I prefer summer, I am quite fond of all four seasons.2Although I prefer summer, I am quite fond, of all four seasons.3Although I prefer summer, I am quite fond of all four seasons.4Although I prefer summer I am quite fond, of all four seasons. Solve the equation.3n + 2= 8 + 2n A. 3 B. 4 C. 5 D. 6 Which of these is NOT a trend in agriculture in the United States today? A) a decrease in small farms B) increased productivity per acre Eliminate large investments in agricultural machinery D) increased percentage of farm workers in the total U.S. population In 1991 the Soviet Union collapsed MAINLY because If 20miles is 1/2 inches how and there is 3.125 inches how many miles