a^2-b^2=21 a-b=3 what is the value of a+b

Answer:

can you specify more

need more information to help you out.

Explanation:

Answer:

2) Static friction is a force that keeps an object at rest .The term sliding friction refers to the resistance created by two objects sliding against each other . This can also be called kinetic friction . Sliding friction is intended to stop an object from moving

3) Friction is caused due to irregularities on the surfaces of objects in contact.If we carefully observe the surface of objects through magnifying lens we will see that there are tiny hills and grooves . When two surfaces come in contact with each other these hills and grooves interlock with one another and thus oppose motion .

Hope this helps :)

Answer:

Rolling friction occurs when a wheel, ball, or cylinder rolls freely over a surface, as in ball and roller bearings. The main source of friction in rolling appears to be dissipation of energy involved in deformation of the objects. If a hard ball is rolling…Rolling friction and sliding friction are caused by the rubbing of the surfaces together. The surface of the floor is rubbing the surface of the moving body. This rubbing results to heat produce during the process and the motion of the body is impeded.

Answer: A. addition of all grade points in completed courses divided by the

number of classes completed.

The basic formula to calculate a student's GPA is the addition of all grade points in completed courses divided by the number of classes completed. Thus, option A is correct.

GPA is an acronym for grade point average and it can be defined as a terminology that is typically used to reflect the performance of a student in all the courses he or she takes in college. Multiplication of all grade points in completed courses divided by the number of classes completed.

On the other hand, course grades is used to describe and reflect the performance of a student in a specific course i.e a single course. Addition of all grade points in completed courses and subtraction of all uncompleted courses.

In conclusion, the difference between course grades and grade point average (GPA) is that course grades is used to reflect the performance of a student in a specific course while grade point average (GPA) reflect the performance of a student in all courses.

Therefore, The basic formula to calculate a student's GPA is the addition of all grade points in completed courses divided by the number of classes completed. Thus, option A is correct.

Learn more about  grade point average on:

https://brainly.com/question/29193406

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Answer:

C. starches

Explanation:

Starches generate adenosine triphosphate (ATP) at the fastest rate.  :)

Answer:

Kallis' SAT Pattern Strategy

Explanation:

The SAT questions in Kallis are realistic and are very similar to official test questions as well as giving very good step-by-step answer explanations for each of its questions. It is, however, relatively expensive. (Around $30)

Answer:

[tex]\frac{5}{9}[/tex]

Explanation:

1) Reduce the [tex]\frac{12}{15}[/tex] to [tex]\frac{4}{5}[/tex] by dividing with 3. (12/3 = 4 & 15/3 = 5)

  [tex](\frac{5}{6})^{2}[/tex] × [tex]\frac{4}{5}[/tex]

2) Raise the numerator and denominator to the power.

   5×5= 25 & 6×6=36

   [tex]\frac{25}{36}[/tex] × [tex]\frac{4}{5}[/tex]

3) Reduce the numbers (25 & 5) with the greatest common factor 5

    [tex]\frac{5}{36}[/tex] × [tex]\frac{4}{1}[/tex]

4) Multiply the fractions.

    5×4= 20

    36×1= 36

       [tex]\frac{20}{36}[/tex]

5) Simplify.

20÷4 = 5

36÷4 = 9

Answer:

i can help you

Explanation:

what is the question

Answer:

see below

Explanation:

1. The article contains verifiable and checkable facts

Speculation isn’t fact, it’s speculation. Magazines and reputable websites have fact checkers on hand to check sources and content. Every important bit of information needs back up. If there is no basis for a statement or idea, move to an article written by someone who can put his money where his mouth is and back up his facts with proof. Look for studies, surveys, interviews  as the basis for an article.

2. The article presents a balance of the pros and cons

Even in depth investigations leading to a negative result will list the positive plus the negative. If an article is angry in tone or sounds like a perky sales pitch, you’re not receiving all sides of the story. A good writer will present ALL the facts and let the audience draw their own conclusions.

3. Sources are real people not initials or ” word on the street”

Citing vague sources such as “some people say” or “experts claim” doesn’t prove anything. Who are these people? Who are these experts? Look for specifics, “according a study at the Mayo Clinic…” or “freelance writing blogger Anne Wayman says…” These are sources you can check. You can make sure the facts are correct. Vague information only leads to more vague information. Testimonials by unnamed, anonymous sources only tell you they may not be true. Real names back up real facts.

4. Interviews are conducted with all parties involved

If an article presents interviews backing up one side of the story but glaringly omits interviews backing up the other side of the coin, you have to wonder if the author is stating all the facts. A good writer knows his story won’t be hurt by presenting both the pros and the cons.  In fact, a good writer knows if he leaves out important bits of information, his reputation is on the line.

5. The investigation contains actual information instead of handpicked letters from disgruntled sources

If an “investigation” consists of nothing but quotes or email excerpts from angry, no name people, consider the validity of the argument. A good writer isn’t afraid to interview all parties involved for an article, investigation or report. A good reporter doesn’t shape facts for his benefit. If you’re reading an investigative piece that isn’t fair and balanced, move on to the next article.

6. References are provided

As mentioned above, a reliable article includes references so the reader can verify facts and draw his own conclusion. Sources can include reputable university studies, reports and articles from government organizations, books and articles in well known magazines. Using vague web content on free article sites probably isn’t a good idea because many of these articles are written to create traffic for the writer’s website or blog. Always consider the source and check references before making a decision about whether or not an article contains reliable information.

7. Does the author have an agenda?

Does the article sound like an angry, bitter hate piece? It’s probably not a reliable article. Does it sound like the author is trying to drive traffic or promote a product or service? It’s probably not a reliable piece. If an article seems slanted in one direction or another, you’ll have to ask your self if the author has an agenda. Sometimes it’s so obvious you can spot the agenda a mile away. A good, reliable article will be even in tone without trying to sway the reader to one side or the other. Readers should always be left to make their own decisions.

8. The author of the article has a reputation for presenting fair and balanced information

Certain authors build trust among their readers. Good authors sell newspapers, magazines, books and drive traffic to websites. If an author has a reputation for presenting a fair, balanced and reasonable point of view, it’s easier to trust their articles as containing reliable information. (We’ll get into the different ways to trust a particular writer in an upcoming piece).

9. The article contains information not found on every single other article on the web

You can tell when an article is Googled and rewritten over and over again. The articles all sound the same and all contain the same information. Look for the articles that present new facts and arguments. Look for the articles that are written to inform rather than to bring in advertising revenue.

10. The article is hosted on a website or in a publication with a good reputation for providing quality content

Always consider the source. If the article is hosted on a website you haven’t heard of, research its hiring policies. Does it accept anyone without an audition, or do writers and editors have to submit to testing? Does the website or publication have a good reputation for presenting facts without a lot of spin? These are the sources to trust. Don’t blindly accept an article as fact, always consider the source.

Where do you go for your information – and how do you know it’s correct?

Answer:

Family Reunion

Explanation:

Its a good show to watch if you want to have a laugh :)

Answer:

Neither

Explanation:

because neither of them are accelerating

Answer:

4/3

Explanation:

For xy-plane coordinates, points are written as (x, y).

This question gives us two points and two line equations to solve this. Let's start with the first one.

Since p is the x value of the point and r is the y value of the point, we can place these values in our equation y = x + b as follows:

r = p + b

Now we do the same with our second point and line equation. We will substitute 2p for x and 5r for y in the equation y = 2x + b. So we get this:

5r = 2(2p) + b

5r = 4p + b

Since we have this two equations with the same two variables, now we can solve them using the elimination method.

In this case I eliminated b as it is constant in both equations. To do this I subtract the equations in order to cancel the b variable.

5r = 4p + b

r = p + b

_______ -

5r - r = 4p + b - p - b

4r = 3p

4/3 = p/r

Answer:

Cost benefit analysis is a method in which programs total cost by the benefits in the project In monetary units or common units is calculated. This can be used to find the benefits and cost of program and compare it with others.

Explanation:

For example consider a vendor is selling snacks and gaining profit with two helpers at hand he wants to extend his stall and hire two more helpers. For now he is Outsourcing the demand that is not being fulfilled at his place

Answer:

We must not use mobile phones during exams.

Explanation:

Modal verbs are those verbs that are used to express modality, possibility, ability, likelihood, capability, etc in the sentence. The modal verbs include may, must, can, could, should, etc among others.

In the given sentence, the use of mobile phones in exams seems to be the main theme. So, considering the situation of the event, it is fair to say that the modal verb that will replace the verb form in the sentence is "must". This will ensure that the rule is strict adherence to a fair exam.  It also emphasizes the strong sense of the prohibition, having a much stronger effect than the word "should". "Must" gave a definite statement while "should" is a much more lenient statement.

Thus, the appropriate modal verb for the given sentence is "must", making the sentence- "we must not use mobile phones during exams".

Answer:

the volume of the square based pyramid is 24 cm³.

Answer:

A washing machine works with centrifugation.

Explanation:

Centrifugation is a process that implements a rotating force for the separation of liquids and solids.

The centrifugal force in a washing machine is provided by a drum that is attached to a rotating shaft. This centrifugal force allows the water and soap to combine to permeate the clothes, and the rotational force causes the soapy water to clean the dirt.

In addition to this, the centrifugal process removes most of the water from the garments, favoring drying.

Answer:

Take time for yourself every so often, relax, treat yourself, be confident and don't over study. Studying to much can cause stress and you can become overwhelmed super quick, I tend to do it a lot. You don't need to have the perfect score, but don't just get by. Give it all you have and it will pay off, I promise. Don't ever think not making a perfect score on a test will cause your parents to become upset, trying your best will make them proud. You'll see it when you make that above average score! Everyone is intelligent no matter what; you're a smart and talented individual, don't ever forget that. Hopefully everything goes well and good luckk! :)

prayer. prayer works well trust in god.

Answer:

The two main categories of music in the Middle Age and the Renaissance were sacred and secular music. The main differences between sacred and secular music were as follows.

Sacred music is “music composed to praise the holy or divine.” This form of music stands apart from the ordinary affairs of human beings and it conveys feelings related to divinity. Most forms of sacred music consisted of setting biblical verses to music to pay homage to God. Sacred comes from the Latin “sacrare”, which means “to set apart.” Thus, sacred music is set apart or consecrated for use within the liturgy, and it remained strictly under the control of the church.

The Middle Ages witnessed the dominance of the Roman Catholic Church over the minds of people, and this dominance was expressed in the music from this age as well. Boys learned music in schools affiliated with the churches, and monks and priests composed music for liturgical purpose. Women and girls were not permitted to sing in churches. However, nuns learned to sing and composed music for choirs.

Sacred music is not an ordinary form of music. It exists for the sole purpose of glorifying God and encouraging people to think divine thoughts. Gregorian chants were the first form of sacred music, and even later forms of sacred music rarely used musical accompaniments.

Secular music differs from sacred music because it deals with themes unrelated to spirituality, making it the exact opposite of sacred music. It pertains to the living rather than to the divine. Secular implies a shift away from the religious; therefore, this music represented a shift in focus from religious to non-religious composition.

French nobles called troubadours composed secular music and sang the first secular songs (mainly dance songs). Secular music themes eventually ranged from simple ballads to love songs, political songs, war songs, laments, and dance songs. The songs eulogized virtues such as chivalry, valor, honor, and love. Secular music used musical accompaniment and had a specific meter and beats set to the music. Composers during Renaissance experimented with musical forms, breaking with the monotony of sacred music and moving to freer and more expressive forms of music. One of the most important composers of that time was Guillaume de Mauchaut, who wrote both sacred and secular music.

Explanation:

Answer:

Secular music is different form sacred music becasue its purpose is different from Sacred music. Spirituality is very irrelevent when it comes to Secular music. In fact Secular music involves more about living than about the clergymen. 

The whole point of Sacred music is to stimulate religous thoughts into ones mind. 

Explanation:

Heres a shortened re-worded answer.

answer

1). Airplane is flying at 14551 feet.

2). Height of the mountain is 4299 feet.

--------------------------------------------------------------------------------------------------------------

1). An airplane starts at the level = 0 feet

It rose to the altitude = 21000 feet

It descends by the height due to clouds = 4329 feet

So the height of the airplane = 21000 - 4329

= 16671 feet

After giving pass to a plane it ascends by the height = 6333 feet

Now the height of the airplane = 16671 + 6333

= 23004 feet

Then the airplane descends again to give the pass to a airplane again.

Altitude after descending by 8453 feet = 23004 - 8453 = 14551 feet

Airplane is flying at 14551 feet.

2). Distance between the top of the mountain to the floor of the valley = 4392 feet

Valley is 93 feet below the sea level.

Therefore, the height of the mountain will be = 4392 - 93

= 4299 feet

hope this helps you

Answer:

To be a good person is to be kind and respectful to those around you.

Help someone with something. Maybe someone could need help lifting something.

Answer: The ACT is a standardized test that measures a student's skills in five core areas: English, math, reading, science, and writing (optional). Students in grades 11 and 12 take the ACT so that they can submit their scores to colleges as part of the college application process. 75 questions in 45 min.

Answer:

y = 5

Explanation:

S = 2π r² + 2π r h

let r = 5

let h = height of the cylinder

since the equation is re-written in the form h = [tex]\frac{S}{x} -y[/tex]

where x and y are constants.

what is the value of y?

S = (2π r²) + (2π r h)  ------ plug in r = 5

S = (2π * 5²) + (2π * 5 * h)

S = (2π * 50) + (10π h)

S = 50π + 10π h

S - 50π = 10π h

     S - 50π

h = -------------

         10π

       S         50π

h = ------  -  ---------

     10π         10π

       S        

h = ------  -  5

     10π      

therefore,  the value of y = 5

remember the re-written equation  h = [tex]\frac{S}{x} -y[/tex]

and x and y are constants.

x = 10π as constant

y = 5 as constant

hope it clears your mind.

[tex]S=2\pi (5^{2} )+2\pi (5)h\\h=\frac{S}{x} -y\\\\\S=2\pi (5^{2} )+2\pi (5)h\\S=2\pi (25)+10\pi h\\S= 50\pi +10\pi h\\10\pi h= S-50\pi \\h=\frac{S-50\pi }{10\pi } \\h=\frac{S}{10\pi} - \frac{50\pi }{10\pi } \\h=\frac{S}{x}-y = \frac{S}{10\pi} - 5\\y = 5[/tex]

This is a simplified version of ricchad's answer, all credit goes to that person.

Answer:

The pyramid starts with producers, which have the most energy, then primary consumers eat the plants. Then secondary consumers eat the primary consumers. Top level consumers eat the secondary consumers, then decomposers start the process over again. As the pyramid gets higher, there is less energy between levels.

Explanation:

Answer:

Formal education carries high importance

Explanation:

Answer:

d =120

Explanation:

v =d/t

2 hours=120 minutes

10=d/120

cancel the zero in 10 and 120

d =12km

hope this helps you

Answer:

The answer to the question is 13.6g/cm^3

Answer:

13.6

Explanation:

Answer:

Practice with online practice tests or get a college counselor!

Explanation:

I recommend practicing with online practice tests. There are a bunch of act practice tests online and they can help you get a good score.