Explain how rays AB and AC form both a line and an
angle.

Answers

Answer 1

Answer:

Point A is between points B and C. Starting at point A and going past point B, you have ray AB. Starting at point A and going past point C, you have ray AC. If you think of angle BAC, it is a straight angle of 180 degrees!

Answer 2

Sample Response: An angle is defined as two rays with a common endpoint, so CAB (or BAC) is an angle. A line is described as an infinite set of points that extend forever in either direction, which these rays also do.

Explanation:

<3


Related Questions

what is the capital of Combodia?

Answers

Answer:

Phnom Penh

hope this helps :)

when was america istablished?

Answers

Answer:

The answer is,4 July 1776

Answer:

4 July 1776

Explanation:

Why do humans often act in ways that disturb the natural services of the environment?

Answers

Answer:

Humans impact the physical environment in many ways: overpopulation, pollution, burning fossil fuels, and deforestation. Changes like these have triggered climate change, soil erosion, poor air quality, and undrinkable water.

what could be the possible shape of universe with an evidence. ​

Answers

Answer:

Explanation:

8

When we talk about the "shape" of the universe. It is its intrinsic shape, not the embedding of the universe within a larger space.

It does make sense to talk about the intrinsic shape. Properties like "curvature" can be measured from inside a shape, you don't need suppose that the universe is "in" something to talk about its shape.

Now the space of the universe is three dimensional, this creates visualisation problems. So I'm going to first talk about an imaginary 2d universe:

A 2d universe could be flat, with a curved boundary (like a disc) Or it could be flat with no boundary (an flat infinte plane). Or a 2d universe could be intrinsically curved. If it has positive curvature it could be like the surface of a ball (positive curvature, finite with no boundary) Or shaped like a bowl (positive curvature) Alternatively it could have negative curvature: it could be shaped like a "Pringles crisp" These have negative curvature (this can happen with or without a boundary). Finally there could be regions with different curvature: positive in some parts, negative in others.

The same possibilities exist for our universe: It could be flat (with or without boundary) It could be positively curved (This is intrinsic curvature and your brain can't visualise this for a 3d shape) Or it could be negatively curved (again, don't try to visualise this for a 3d shape, you can't). In the case of positive curvature, it could be finite and unbounded, but for negative curvature, it must either have an edge, or be infinite.

So mathematically these are the possibilities. What does the science say?

We can measure the curvature on large scales. Our measurements are not perfect, there is some room for error. We measure the large scale mass/energy density of the universe, since curvature is caused by gravity, and gravity is caused by mass and energy. If the mass/energy density is > 1 then space would be positively curved. We actually find that the energy density is 1.00±0.02 That is the universe is either flat, or very nearly flat.

No there are profound problems with supposing that the universe has a boundary. But there are also problems with supposing it to be infinite. Scientifically, no edge has ever been detected. So when we build models of the universe, we will generally suppose to have no edge.

Thus our "best guess" is that the universe is uncurved and infinite.

NPL also gives services of accurate time-keeping. is it true or false​

Answers

Answer:

it's true

Explanation:

Indian standard time is maintained by National Physical Laboratory

QUICK DUE IN A FEW MINUTES!!!what’s my responsibility as a citizen to the earth

Answers

Answer:

growth

Explanation:

ur living the life as once ur was a child than a kid to a teen and final to adults there many purpose as ur responsivlity

Date
Page
in the past not trade
think our
our people
you
Why do
large scale?
in a​

Answers

Answer:

huh? im confused on what you are asking me

Which latitude band has 4 distinct seasons? (Use Latitude and Longitude
Notes)
a. Equator
b. Low 0-30
c. Mid 30-60
d. High 60-90​

Answers

Answer:

Option A is correct

Mark me BrainLiest please

Explain the features on the planet Earth that allows living things to live on the planet.​

Answers

Answer:

Distance of the Earth from the Sun- The Earth and the Sun are equally important because without the Sun's heat and light, the Earth would be a lifeless ball of ice-coated rocks. It regulates the temperature of water bodies, weather patterns and provides energy to the growth of plants. The distance of the Earth from the Sun makes it a perfect reason for the life because it receives the perfect amount of heat and light to allow life to be created and to support it. Light on the Earth- Earth is the only planet that uses the Sun’s light as useful as a source of energy. That energy is used to convert elements, by living things, into a useable form. A plant uses the energy provided by the sun to drive photosynthesis and provide food to grow. As a by-product, oxygen is released which we then use as an energy source of our own. The Earth's Atmosphere- It is the layers of gases surrounding the earth that consists of exosphere, thermosphere, mesosphere, stratosphere and troposphere. The air content and favourable atmospheric pressure also supported life of most creatures. The less air content of carbon dioxide helps to moderate the Earth's temperature and is absorbed by plants during photosynthesis to produce oxygen.The Ozone Layer- It is the Ozone layer that is a part of Earth's atmosphere situated in the stratosphere, which makes protects life on Earth from its potentially harmful effects of shorter wavelength and highly hazardous ultraviolet radiation (UVR) from the sun.                       The Sun emits enormous amounts of heat and light that also consists of ultraviolet radiation (UV rays). Only about 1% of the ultraviolet radiation that the Sun sends to Earth actually reaches the surface. Small amounts of exposure to UV rays are beneficial because they cause the body to produce Vitamin D, which has several health benefits. However, too much exposure to UV rays causes serious issues on our skin and health.Climate Conditions- The Earth has a suitable climate for the existence of all forms of life because of moderate amount of carbon dioxide, which is the driving factor for the survival of life forms. Water- Water is very important for life because it contains the oxygen needed for life and allows life-providing molecules to move around easily. It continually changes its form through the water cycle.                                 Gravitational Pull on Earth- The Sun's gravitational pull keeps our planet orbiting the Sun and the Earth, which holds everything from topography to all forms of life. The force of gravity doesn’t just keep us anchored to the ground, but also affects our biological system.                 Hence, Earth is the only planet which hosts liquid water on its surface, allowing for a direct transfer of energy from the sun in order for photosynthetic life forms to evolve. It has an unique surface which is neither too hot nor too cold for the occurrence of complex biochemical process.

Question 6 of 15 In a traditional society, why might those in power resist change? Check all that apply. A. Change can undermine cultural traditions. B. Change is good for the country. O C. Those in power often have an economic advantage over those without power. D. They don't want to share their power. SUBMIT​

Answers

Hi! The options which I believe are true are A., C., and D. I think these are the correct answers in my opinion because change can erode the base of traditions which they may not like, they don’t want to lose the economic advantage over those without power, and they don’t want to lose there power. I hope this helped, Goodluck :)

Find the DISTANCES of AB and CD to determine if AB is congruent to CD. A(-7,1) B(-4,-3) C(3,-5) D(7,-2)

Answers

Answer:

AB is congruent to CD

Explanation:

Given the following :

A(-7,1) B(-4,-3) C(3,-5) D(7,-2)

Distance AB:

A(-7,1) ; B(-4,-3) ;

AB = √[(X2 - x1)^2 + (y2 - y1)^2]

AB = √[(-4 - (-7))^2 + (-3 - 1)^2]

AB = √[(-4 + 7)^2 + (-3 - 1)^2]

AB = √[(3)^2 + (-4)^2]

AB = √(9 + 16)

AB = √25

AB = 5

C(3,-5) D(7,-2)

Distance CD ; x1 = 3, y1 = - 5, x2 = 7, y2 = - 2

CD = √[(X2 - x1)^2 + (y2 - y1)^2]

CD = √[(7 - 3)^2 + (-2 - (-5))^2]

CD = √[( 4 )^2 + (-2 + 5)^2]

CD = √[(4)^2 + (3)^2]

CD = √(16 + 9)

CD = √25

CD = 5

CD = AB, Hence, AB is Congruent to CD

Floodplains are hazardous areas and should be avoided when considering where to put farmlands. b. Early civilizations of Egypt, India, and China were established in river valleys and on floodplains. c. Use of the waters of major rivers, like the Colorado River, has not affected their size or discharge. d. If a dam is constructed properly, it will not change the ecosystem of the area it's in.

Answers

Hagga
Sbj ia ia i haiqv iqgB. Iab

In North Korea, all factories and businesses are owned by the government. What type of economy does North Korea have?

Answers

Answer:

Controlled Command Economy

Explanation:

hope i helped

Given that point A is the midpoint of line segment ED, where E( -1,9) and A(4,5), what is the location of point D?

Answers

Answer:

D(9, 1)

Explanation:

Since A is the midpoint of ED, then;

A = ([tex]\frac{X_{1}+X_{2} }{2}[/tex], [tex]\frac{Y_{1}+Y_{2} }{2}[/tex])

A(4, 5) ⇒ 4 =  [tex]\frac{X_{1}+X_{2} }{2}[/tex] and 5 = [tex]\frac{Y_{1}+Y_{2} }{2}[/tex]

[tex]\frac{X_{1}+X_{2} }{2}[/tex] = 4

[tex]X_{1}[/tex] + [tex]X_{2}[/tex] = 8

But [tex]X_{1}[/tex] = -1, then;

-1 + [tex]X_{2}[/tex] = 8

[tex]X_{2}[/tex] = 9

[tex]\frac{Y_{1}+Y_{2} }{2}[/tex] = 5

[tex]Y_{1}[/tex] + [tex]Y_{2}[/tex] = 10

But [tex]Y_{1}[/tex] = 9, then;

9 + [tex]Y_{2}[/tex]  = 10

[tex]Y_{2}[/tex]  = 1

Therefore, point D has coordinates (9, 1).

Suppose Earth’s axis was perpendicular to the plane of Earth’s orbit around the Sun. How would the climate at the place you live differ from the climate today? How would it change if Earth’s orbit became much more elliptical?

Answers

Answer:

the earth is tilted 28 degree

Explanation:

The main reason why we have seasons during the year is because the Earth is tilted 23.5 degrees on its axis. In it's orbit around the sun, when the Earth is tilted toward the sun it is summer in the Northern Hemisphere and when the Earth is tilted away from the sun it is winter in the Northern Hemisphere. In the Southern Hemisphere it would be the other way round. Since the Earth orbits the sun steadily, this pattern repeats itself every year.

Well, if the Earth was not tilted, the plane of the Earth's poles would always be perpendicular to the sun, and. The sun would always be just on the horizon 24 hours a day on every day at the poles. There will be no nights at all in the polar regions. Every day would be an "equinox" and throughout the Earth (except the polar regions) there will be a 12 hour "day" and a 12 hour "night" and the sun angle would be about the same every day. There would no longer be seasons as we know them now. The climate, i.e., temperature and the rainfall pattern would not vary much. It would always be hot in the equatorial region and cold at the polar egions. The same climate will last throughout the year, and year after year.

The changes in the oceans and atmosphere would result in tremendous and unpredictable changes in conditions on the earth's surface including shifts in the oceans' levels and changes in the location and extent tropical areas. The tropic of Cancer and tropic of Capricorn would be meaningless because there would be no more "solstices" - it would be an eternal "equinox" meaning the sun rises exactly due East, and sets exactly due West after passing over the equator, day after day, year after year.

There will be a profound effect on the migratory birds and animals. They will find no reason for migration as there are no more seasons. Imagine what may happen if all the bird migration stops! Presently, because of migration, the population of millions of migratory/non migratory creatures are in balance; but if there were no migration, their populations may increase uncontrollably, causing a major zoological imbalance. (Imagine what will happen in East Africa. Every year, blue wildebeest have a long-distance migration looking for greener pastures, coinciding with the annual pattern of rainfall and grass growth. With no seasons there would be no need to migrate.)

And then, an Earth without it's tilt would be divided into climate "bands" that would get progressively colder as we moved away from the equator in both directions. People may not be able to survive the continuous winter of the higher latitudes - like Scandinavia, Greenland, Siberia, Mongolia etc. - and so the population of the Earth would probably concentrate in the midsection tropical/equatorial regions of the planet. Needless to mention, there would be chaos! We may not be able to feed ourselves anymore, because:

The tropical zone would be humid and so, continuous rainfall would quickly erode the soil and drain away the top-soil and the nutrients, making the land useless for agriculture.

We would be plagued by diseases, the pathogens of which thrive in warm, humid environments. You must be aware that cold climate protects much of the world's population from disease carrying tropical insects which account for diseases not only in humans, but also crops and livestock. The tropics is home to MALARIA, EBOLA, and HIV. We just cannot imagine the devastation caused by deaths due to diseases coupled with hunger. As I write this, the world population is 7.32 billion and the annual increase is estimated at 1.10%. Imagine the lot living within some 40° north and south of the equator!

Let's not forget, as our numbers increase, the numbers of other inhabitants of the planet has steadily decreased; many species have even gone extinct due to loss of habitat, pollution, and global warming. With the human population concentrated in the tropical regions, there is bound to be overfishing and over-hunting. Scientists believe that with the current rate of extinction, we will experience a mass extinction in which 75 percent of the planet's species will be extinct within short period of time, like 300 years or so. On an Earth without it's tilt, it would be a lot sooner.

So whatsay, we let the present tilt of the Earth continue until further notice?

Add: Eclipses will become common. Every new-moon will be a solar eclipse and every full moon a lunar eclipse. Some of the solar eclipses would be total, while others would be annular, depending on the how far the moon is from the earth.

Which of the following best describes "overburden"?

Drilling underneath layers of rock and soil

Rock and soil that is removed to mine ore

Reclamation of land from mining ore

Residue that is left over from mining ore

Answers

Answer:

B. Rock and soil that is removed to mine ore.

Explanation:

Overburden is a material or substances that is present above the metal ore. This metal ore is present inside the rock and soil so for its extraction the rock and soil must be removed that is present above it. Metal ore such as gold, silver,coal, iron and platinum are present inside the earth crust. These metals are not present in pure form some soil particles or other substances are present with it which is removed with the help of various instruments and machines.

Why do many Georgia rivers begin in the Blue Ridge province?

Answers

Answer:

The Blue Ridge receives the most precipitation of all the regions in Georgia and hosts the headwaters of the Savannah,

Many rivers in Georgia, including the Chattahoochee, Savannah, and Oconee, originate in the Blue Ridge province due to the region's unique geological and topographical characteristics. The Blue Ridge province is characterized by its high elevation, rugged terrain, and ample rainfall. These factors contribute to the formation of numerous streams and rivers.

The elevated landscape of the Blue Ridge province allows for the accumulation of precipitation, which leads to the formation of springs and small streams. As these small streams converge and flow downhill, they gather volume and momentum, eventually evolving into larger rivers that meander through the state.

Additionally, the porous and fractured nature of the rocks in the Blue Ridge region enables water to seep into the ground, replenishing underground aquifers. When these aquifers reach their capacity, they discharge water into the surface streams, further contributing to the formation of rivers.

To learn more about topographical, click here.

https://brainly.com/question/1026002

#SPJ2

What factors affect water quality

Answers

Answer:

Many factors affect water quality

Sedimentation

Runoff

Erosion

Dissolved oxygen

pH

Temperature

Decayed organic materials

Pesticides

Toxic and hazardous substances

Oils, grease, and other chemicals

Detergents

Litter and rubbish

Answer: There are so many factors which may/will affect the quality of water

Explanation: such as

i) Acid : it may come from acid rain and etc.....

ii) toxic waste materials : especially from high operating factories

iii) Oil spillage: accidents during oil shipping etc....

iv) littering: dumping of trash and rubbish

v) toxic substances; may come from harmful chemicals which are used in fishing etc... pesticides

vi) bathing and washing in water bodies with animals affects water quality

vii) dumping of waste products into water bodies

viii) mining underground activities

ix) Erosion may also affect water quality

x) leakages: especially in sewage pipes

HOPE THIS HELPSS!!!!!!!!!!!

What plate activity is occurring in the picture?

Answers

Answer:

[tex]\boxed{\sf Convergent}[/tex]

Explanation:

The plate activity shown in the picture is convergent, convergent is where two plates run into each other.

Does any one know where I can get A level geography notes online ?
Thank you

Answers

just search up geography notes online and see what comes up

Answer:

gceguide website

tutor2u

snaprevise

geography-revision.co.uk

geographyrevisionalevel.weebly.com

Explanation:

They work for either AQA or CIE

you can also check slideshare.net as many people post as and a level notes, just search through thoroughly.

Your welcome


Which piece of evidence explains WHY the 5 themes of geography were created?

A.In 1984, educators sought to better organize the teaching of geography in kindergarten through 12th grade classrooms.

B.The themes were created by the National Council for Geographic Education & the
Association of American Geographers.

C.While these five themes have been since replaced by the National Geography
Standards, they still provide an effective organization for the teaching of geography.

D.Humans shape the landscape through their interaction with the land; this has both positive & negative effects on the environment.

Answers

Answer:

g

Explanation:

why do you think our people in the past not trade in a large scale?​

Answers

Answer:

The Industrial Revolution, for example, brought large-scale changes to our socio-economic structures and the kinds of work people

Which of the following statements about political maps are true? Check all that apply. I A. They never show any physical features of land. B. They are the most common type of map. O C. They will show capital cities, major cities, and large lakes or rivers D. They may show how areas are broken into countries and states.​

Answers

Answer:

B, C, D

Explanation:

If you look up a political map you can see they they are the most common map, they are what we use to find cities and landmarks, and they are the kind of map that show you where all the states or countries borders are.

The concept of natural rights which was used in the Declaration of Independence was first proposed by

Answers

Answer:

John Locke

Explanation:

The concept of natural rights was first proposed by an English philosopher called John Locke. He emphasized there factors known as Life, Liberty, and Property as being the core of independence and should be non-negotiable or sacrificed for anything.

This was adopted in the Declaration of Independence of the United States from Great Britain on July 4, 1776.

Why is millet grown in the Sahel? A. It tastes better than wheat or barley. B. It is cheaper to grow than wheat or barley. C. It requires less water to grow than other grains. D. It has a longer cultivation cycle than other grains.

Answers

I would say C. It makes sense

Answer:

D. It has a longer cultivation cycle than other grains.

Explanation:

HELP!!! WILL MARK BRAINLIEST!!

Which are examples of climate’s impact on the natural character of a location?

SELECT ALL THAT APPLIES. NOT JUST ONE. MOVE ON IF YOU DON'T KNOW PLEASE THANK YOU!!

A. a year-long drought

B. solar radiation

C. the amount of total precipitation

D. accrued snowfalls in mountainous areas

Answers

Answer:

the amount of total precipitation

HELP!! ILL GIVE 15 POINTS AND BRAINLIEST! How did the Neolithic Revolution spread from place to place?

Answers

Answer:

Hi! The answer is through demic diffusion.

Explanation:

It was the world's first historically verifiable revolution in agriculture. The Neolithic Revolution greatly narrowed the diversity of foods available, resulting in a downturn in the quality of human nutrition.

The Neolithic Revolution involved far more than the adoption of a limited set of food-producing techniques.

It is well known that the Neolithic transition spread across Europe at a speed of about 1 km/yr. This result has been previously interpreted as a range expansion of the Neolithic driven mainly by demic diffusion (whereas cultural diffusion played a secondary role).

Hope this helped!

Answer:

According to the study, the Neolithic settlers from northern Greece and the Marmara Sea region of western Turkey reached central Europe via a Balkan route and the Iberian Peninsula via a Mediterranean route. These colonists brought sedentary life, agriculture, and domestic animals and plants to Europe.

It was the world's first historically verifiable revolution in agriculture. The Neolithic Revolution greatly narrowed the diversity of foods available, resulting in a downturn in the quality of human nutrition. The Neolithic Revolution involved far more than the adoption of a limited set of food-producing techniques. It is well known that the Neolithic transition spread across Europe at a speed of about 1 km/yr. This result has been previously interpreted as a range expansion of the Neolithic driven mainly by dermic diffusion.

Hopefully, this helped! :D

If you were to set out to make a model that might be used to predict global climates 50 years into the future, what kind of climate data would you put into your model? Once you have developed your model, how might you test it?

Answers

Answer:

If I were to make a model to predict the global climate over the next 50 years, I would use the following climate data:

temperature - to be able to observe if there is a tendency to increase or decrease and the impact on glaciers, sea level rise.amount of precipitation - to observe the evolution of precipitations in desert and arid areas and make a forecast.humidity

Explain how species within the natural environment work together.

Answers

Answer:

This happens by the process of natural selection. By natural selection, the nature of the species gradually changes to become adapted to the niche. If a species becomes very well adapted to its environment, and if the environment does not change, species can exist for a very long time before they become extinct.

The ones that will be discussed in this article are competition, predation, herbivory and symbiosis. These are not the only types of species interactions, just the most studied — and they are all parts of a larger network of interactions that make up the complex relationships occurring in nature.

Explanation:

plz mark me as brainliest plz

What conditions will increase a nation's Human Development Index? Check all that apply. 0 A. Long work hours O B. A commitment to the education of its population C. The highest gross domestic product in the world D. People who live longer than the world average ​

Answers

Hey there! I'm happy to help!

The Human Development Index takes into account 3 main things about a country:

1. Life Expectancy

2. Education

3. Standard of Living

Long work hours don't necessarily have to do with any of these categories  and it can also be associated with human rights violations (slavery, sweatshops, etc.), so this will not increase a country's HDI, so A is incorrect.

A commitment to education will definitely increase a nation's HDI. Gaining knowledge is part of human development, and a great education system hugely facilitates that. B is correct.

It might seem like having the highest GDP will make a country have a better standard of living, but this isn't always the case. A country could produce tons of things but pay the workers very little, so this would not lead to a good standard living. Although a high GDP usually means that a country is doing better, it doesn't necessarily increase a nation's HDI, so C is incorrect.

D is correct because living longer means that the life expectancy is higher. This means that better healthcare, services, treatments, medicines, opportunities, etc. are available in the country, and being able to live longer is very important for human development.

Have a wonderful day and keep on learning! :D

Answer: C. a commitment to the education of its population

D. people who live longer than the world average

Explanation:

I took the quiz

Other Questions
A normal distribution has a mean of 30 and a variance of 5.Find N such that the probability that the mean of N observations exceeds 30.5 is 1%. The check_time function checks for the time format of a 12-hour clock, as follows: the hour is between 1 and 12, with no leading zero, followed by a colon, then minutes between 00 and 59, then an optional space, and then AM or PM, in upper or lower case. Fill in the regular expression to do that. How many of the concepts that you just learned can you use here On a map 1 cm represents 4.5km. What is the actual distance between two towns which are 4cm apart on the map? If (x+2),3x and (4x+1)are in AP find the value of x Please help! Algebra 1. IIfm DGF = 72, what equation can you use to find mZEGF? (C++) Write code to complete RaiseToPower(). Sample output if userBase is 4 and userExponent is 2 is shown below. Note: This example is for practicing recursion; a non-recursive function, or using the built-in function pow(), would be more common.4^2 = 16Given: #nclude using namespace std;int RaiseToPower(int baseVal, int exponentVal){int resultVal = 0;if (exponentVal == 0) {resultVal = 1;}else {resultVal = baseVal * //your solution goes here;}return resultVal;}int main() {int userBase = 0;int userExponent = 0;userBase = 4;userExponent = 2;cout an object travels 16 metre in 4 seconds and then another 16 metre in 2second what is the average speed of the object what is the angle taken in clockwise direction between : (1) North- east and north- west . A 70 kg man floats in freshwater with 3.2% of his volume above water when his lungs are empty, and 4.85% of his volume above water when his lungs are full.Required:a. Calculate the volume of air he inhales - called his lung capacity - in liters. b. Does this lung volume seem reasonable? light sweet petroleum, inc., is trying to evaluate a generation project with cash flows:________. year Cash Flow 0 -38,600,000 1 62,600,000 2 - 11,600,000a-1 What is the NPV for the project if the company requires a return of 11 percent? (Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.) NPV _______a-2 Should the company accept this project? A. Yes B. N b. This project has two IRR's, namely _______ percent and ______ percent, in order from smallest to largest. (Note: If you can only compute one IRR value, you should input that amount into both answer boxes in order to obtain some credit.) (A negative answer should be indicated by a minus sign. Classroom routines1. Describe the end of day routine in the class What is principle of liver?? A vat of milk has spilled on a tile floor. The milk flow can be expressed with the function r(t) = 4t, where t represents time in minutes and r represents how far the milk is spreading.The spilled milk is creating a circular pattern on the tile. The area of the pattern can be expressed as A(r) = r2.Part A: Find the area of the circle of spilled milk as a function of time, or A[r(t)]. Show your work. Part B: How large is the area of spilled milk after 4 minutes? You may use 3.14 to approximate in this problem. 3. What conclusion can you make about the electric field strength between two parallel plates? Explain your answer referencing Photo 2. The sum of two polynomials is 10a^2b^2-8a^2b+6ab^2-4ab+2 if one addend is -5a^2b^2+12a^2b-5 what is the other addend help i want help i want help show the constitution development in nepal in a timeline What is biology??And what does it came from?? Given that the sum of squares for error is 60 and the sum of squares for regression is 140, then the coefficient of determination is: