In the course of invention, sometimes what could have been a simple accident is instead transformed into a lucky event. Elaborate on how this happens, citing evidence from the article.

RED BANK, New Jersey (Achieve3000, September 15, 2021). One day in 1943, a naval engineer was toying with springs and coils of wire, developing suspension systems for sensitive ship instruments. He turned and inadvertently knocked some loose parts off a shelf. To his amusement, a spare spring tumbled and seemed to walk across his desk, down some books, and onto the floor. In that moment, a proverbial light bulb went on for a delighted if clumsy engineer named Richard James. It would take a year of experimentation and tinkering to find the best materials and design, and even longer to figure out how to convince people to buy his creation. However, the toy we now know as the Slinky took its first steps thanks to a random accident and James's creative thinking.

As a rule, the process of invention requires a dynamic churn of necessity, knowledge, curiosity, effort, and perseverance. Every so often, though, serendipity pokes its nose into the workshop or laboratory. When that happens, it can send the endeavor in new and surprising directions. Such happy accidents have resulted in the discovery or creation of revolutionary technologies, life-saving medicines…and yes, even toys.

Small mishaps can lead to world-changing innovations, and in one case helped identify the family of drugs that has saved more lives than any other: antibiotics. Arthur Fleming was a Scottish physician and researcher. In 1928, he began a series of experiments on staphylococcal bacteria. One day he accidentally left an uncovered Petri dish near an open window where mold spores of the Penicillium genus contaminated the sample. Fleming noted that wherever the mold grew, the bacteria died. He isolated the substance, which he named penicillin, and found it was effective in killing an array of bacteria responsible for such deadly scourges as scarlet fever, pneumonia, and meningitis. Other scientists and researchers gradually built on Fleming's accident-aided discovery, while the desperate need for antibiotics during World War II (1939-1945) fast-tracked its development. It is now considered a "wonder drug" that has allowed doctors to treat a number of bacterial infections quickly and effectively.

Sometimes a stashed candy bar can seemingly act as a magnet for a lucky discovery. In 1945, American engineer Percy Spencer was testing radio wave-producing magnetrons used in radar. As he worked, he noticed that the snack in his pocket was melting for no obvious reason. On suspicion, he put popcorn in the equipment—it popped. Then he tried an egg which promptly exploded. Spencer and his company, Raytheon, patented the technology for cooking purposes, and the idea for the microwave oven was born. Still, 30 years passed before a model small and cheap enough was available for the average home.

Sometimes invention is a process of seeing something old in a new way, like Kutol Wallpaper Cleaner. By the 1950s, the company needed a miracle to save its business. It manufactured a clay-like product used to remove soot and dirt from wallpaper. Kay Zufall, the sister-in-law of the company's owner, came up with an ingenious repurposing. A nursery school teacher, Zufall found her young charges loved shaping the moldable, non-toxic substance into anything that they could imagine. She also proposed a new name for the former wall cleaner—Play-Doh. The now ubiquitous putty was introduced to toy store shelves in 1956.

Necessity is the mother of invention, it's been said, and most inventions are about developing new ways to tackle old quandaries. In some cases, good luck shows up to lend a hand—as long as the inventor is able to spot it and willing to follow where it leads.

Answers

Answer 1

Inventions do not always happen from a structured and controlled process. Sometimes, accidents such as Richard James knocking off a shelf and observing how a spring moves result in a new toy. Other times what causes an invention is forgetting things and having a mishap. This is the case with Arthur Fleming. In an investigation, he forgot a petri dish uncovered and saw how penicillin in spores killed bacteria. Thanks to that mishap, today, we have penicillin as an effective antibiotic to treat infections.

There are many examples in the text of how inventions took place. Only two of them were accidents:

In the first paragraph, the accident was, " He turned and inadvertently knocked some loose parts off a shelf... a spare spring tumbled and seemed to walk across his desk."In the second paragraph, the accident was, "One day he accidentally left an uncovered Petri dish near an open window where mold spores of the Penicillium genus contaminated the sample," and the result was " Fleming noted that wherever the mold grew, the bacteria died. He isolated the substance, which he named penicillin, and found it was effective in killing an array of bacteria."The fourth paragraph does not describe an accident. It happened by chance. "As he worked, he noticed that the snack in his pocket was melting for no obvious reason."The last invention described was not an accident either. It was a product used differently.

To sum up, the two inventions that took place thanks to an accident were penicillin and the Slinky toy.

Learn more at:

https://brainly.com/question/560897?referrer=searchResults


Related Questions

What is the role of the main character in "The Shawl" and how does the main character contribute to the theme you chose in question one. Please make sure to answer the question fully and use textual evidence to support your thinking

Answers

Answer:

The role of the main character in 'The Shawl' is to keep herself and her daughter and her niece survived during the Holocaust.

The dominant theme of the story is 'survival' which is portrayed by the main character, first, in her thoughts of passing her daughter to someone who would take care of her, or help her daughter survive the cruelty of the concentration camps. Second, when they were in the camp. Third, when she witnessed her daughter being electrocuted and do nothing for the sake of her own survival.

Explanation:

'The Shawl' is a short story written by Cynthia Ozick. The Shawl is one of the most absorbing and enrapturing story by Cynthia. The story is set during the time of Holocaust.

The protagonist of the story is Rosa, a Jewish woman who is confined in the Concentration Camp along with her infant daughter, Magda, and niece, Stella. Rosa plays the role of a survivor throughtout the story.

Survival is also the dominant theme of the story. All the three character's main propoganda is to survive in the harshness of the concentration camp. But main role in this surviving was played by Rosa, who is responsible not only for own survival but her daughter and niece as well.

When Rosa alongwith her daughter and niece was being marched, she thought of handing her daughter to someone standing beside the road because her daughter would be found, she would be killed. She was thinking at that moment for her daughter's survival.

'Rosa, floating, dreamed of giving Magda away in one of the villages. She could leave the line for a minute and push Magda into the hands of any woman on the side of the road. But if she moved out of line they might shoot.' (textual evidence)

The second instance where Rosa contributed to the survival theme of the story when they were in the concentration camp. They had to struggle daily with survival in the concentration camp. Rosa's main intent in the camp was to keep her daughter alive more than her own life. Magda was an infant so thin and vunerable. Rosa would offer mostt of her food to her daughter to keep her alive and survived.

'Rosa gave almost all her food to Magda, ...' (textual evidence)

The third instance when Rosa contributed to the theme of survivor was when she thought of keeping herself alive. When her daughter, Magda was being electrocuted by the soldier, she ceased herself from going out and comforting or gathering the dead body of her daughter, because if she would go out she would be killed too.

'And the moment Magda’s feathered round head and her pencil legs and balloonish belly and zigzag arms splashed against the fence, the steel voices went mad in their growling, urging Rosa to run and run to the spot where Magda had fallen from her flight against the electrified fence; but of course Rosa did not obey them. She only stood, because if she ran they would shoot, ...' (textual evidence)

These instances also reveals the role of Rosa as a survivor.

If you were to go merely by the quantity of his imitators, you could argue that Dashiell Hammett was a more important writer than James Joyce. He gave his imitators more than an attitude; he gave them a cast of characters, a resilient plot, a setting, a repertory of images, a style, a keyhole view of society, an ethos, and, above all, a hero. Sam Spade is an old American type brought up to date, Hawkeye become private eye with fedora and street smarts instead of leather stockings and wood lore, his turf the last frontier of San Francisco.
In the last sentence, the comparison of Sam Spade to Hawkeye alludes to novels by

Answers

James Fenimore Cooper. However, the comparison between Dashiell Hammett and James Joyce cannot be solely based on the quantity of their imitators.

While Hammett may have had more imitators due to the popularity of his detective novels, James Joyce's influence on modernist literature cannot be denied. Joyce's experimental style and use of stream-of-consciousness narration paved the way for future literary movements. His works, such as Ulysses and Finnegans Wake, challenged traditional narrative structures and language, and continue to be studied and celebrated today.

To know more about narrative refer :

https://brainly.com/question/1021813

#SPJ11

It's a pity that I don't have any/a/a/some camera now

Answers

Yes everything is a pity for sure, life is too
It's a pity that I don't have any/a/a/some camera now

I need some ideas for my assignment thank you.

What would you do if your plane crashed in the middle of the woods? How would you survive?

Answers

Answer:

i would check the planes radio system try to get help then i would see what type of jungle or set of woods im in then i would look for food and people and check for anymore survivors then i would try to make shelter with the wood and the emergency hatchet on the plane

Explanation:

Answer:

Well first I would see if anyone else survived, then I would look for the

Explanation:

Well first I would see if anyone else survived, then I would look for the first aid kit in case I am injured. Then I would also look for any food or drinking water to last me until I run out. Another thing I would do is look for or make a weapon because I do not know what is out there you know. And finally I would do my best to find or make a shelter.

Non fiction: informational and argumentative texts

Non fiction: informational and argumentative texts

Answers

Answer:

this question written does not shown well on my screen

The book Sara is reading is very interesting, and it is interesting because it is a graphic novel.

Answers

Answer:What’s the question

Explanation:

Which sentence uses numbers correctly?a. -I have 6 more days until promotion.b. -I have six more days until promotion.

Answers

The correct sentence is "I have six more days until promotion." Numbers should be written out when they are one to nine, and should be written as numerals when they are 10 or higher.

In this sentence, the number is six, so it should be written out. Writing numbers correctly can help form a more accurate and understandable sentence, and it can also help create a more professional tone. Writing out numbers when they are one to nine is especially important when writing formal documents, such as business plans, reports, and proposals.

When writing out a number, it should be written in word form, rather than spelled out letter-by-letter. For example, instead of writing "s-i-x," the number should be written as "six." Following this rule helps to make a document look more organized, and can help make sure the reader understands the information as accurately as possible.

know more about promotion here

https://brainly.com/question/20472836#

#SPJ11

Read this sentence.
Many plants survived the eruption of Mt. St. Helens, and their presence brought deer back to the area.
What type of sentence is this?
O compound
O simple
O complex
O
compound-complex

Answers

It is a compound-complex sentence where there are two phrases used together and there is one dependant. Thus, option "D" is correct.

For example, because my pizza was too cold I heated it in the microwave. There the sentence given here is an example of a compound-complex sentence.

What are the examples of the compound complex?

More such examples are, I waited for too long but then I decided to go alone. In compound-complex sentences, there is a dependence on which the sentence is based. The two phrases are linked together with that dependence.

Thus, option "D" is correct.

To learn more about compound-complex click here;

https://brainly.com/question/23978145

#SPJ1

how does the structure of the. story create suspense

how does the structure of the. story create suspense

Answers

The importance of the narrative structure cannot be overstated in creating a sense of anticipation.

What is structure

The story structure is crucial for suspense. Techniques to generate suspense in storytelling include an intriguing opening that captures the reader's attention.

Curiosity in the beginning builds suspense. Rising Action: escalating events build suspense. Rising action: Obstacles arise, increasing uncertainty. Engaging surprises keep readers guessing.

Learn more about structure  from

https://brainly.com/question/12053427

#SPJ1

Write an 8-10 sentence paragraph using at least 15 of the words

person

ox

woman

man

child

tooth

foot

goose

mouse

louse

deer

moose

spacecraft

series

species

offspring

deer

fish

sheep

shrimp

knife

life

calf

leaf

potato

tomato

hero

Answers

Answer:

Walking down the road I saw a person it was a woman with I knife and tomatoes, potato and a fish

Please help me please I don’t understand:(

Please help me please I dont understand:(

Answers

Answer:

Why u make so many acs

Explanation:

WHY?

2. Why do you think people in the Renaissance wanted a rebirth of
ancient Greek and Roman times?

Answers

Answer:

The Renaissance was an era when learning and inquiry were beginning to take hold within society over what is sometimes considered to be the dogma and mysticism of the Middle Ages. It was a "rebirth" (Renaissance literally translates to rebirth from Latin) of ideas and art of the Ancient Greeks and Romans.

Explanation:

List at least FIVE questions you had or connections you made through reading this text. FROM THE BOOK OF NATURE BY RUSKIN BONDS NEED IT ASAP!! I WILL MARK THEM AS THE BRAINIEST

Answers

Answer:sdv

Explanation:dvs

Please help! Will give brainlest! Already overdue :(

Please help! Will give brainlest! Already overdue :(

Answers

Answer:

I dont know what to put.

Explanation:

Logical.Logic is humor.Humor is logic.But a qoute with logic makes sense and doesnt sound like jibberish.I hope you have some luck,I dont know the rest but good luck once again.

what component(s) of an introduction is not in an epideictic speech but is in informative and persuasive speeches?

Answers

A thesis is a component that is found in an informative speech and you do not need an argument described in a persuasive speech.

The thesis has used the beginning of an argumentative text, a confirmation whose points have been argued, demonstrated, or justified in some way. A thesis is a scientific affirmation of an idea that is exposed in an open. Persuasive speaking is connected to the audience, since the speaker must, engage the audience. Persuasion is not really controlled by the speaker but rather when an audience listens and agrees to what a speaker says. Informative speaking is on talking about people, events, and places.

To read more about persuasive and informative speeches visit:

brainly.com/question/3677865

#SPJ4

Read the sentence. The captain was chosen for her ability to boost the team’s morale, spirits, and confidence. Based on the context, which is the nearest meaning of the word "morale?” Responses capacity capacity enthusiasm enthusiasm preparation preparation popularity popularity

Answers

The answer is enthusiasm

Write an essay about why you want to become a doctor

Answers

Answer:

I want to help people.

I want to practice culturally-competent care.

I want to make a connection with people.

I want to improve people's lives.

I want to help the underserved.

I find the human body fascinating.

Explanation:

pls mark brainliest

Which of these quotations contains a description of an epic hero?

"Now, by the gods, I drove my big hand spike deep in the embers, charring it again, and cheered my men along with the battle talk to keep their courage up: no quitting now."

"O Cyclops! Would you feast on my companions? Puny, am I, in a cave man's hands? How do you like the beating that we gave you, you cannibal?"


"Cyclops, you ask my honorable name? Remember the gift you promised me, and I shall tell you. My name is Nohbdy: mother, father, and friends, everyone calls me Nohbdy."

"My ship? Poseidon Lord, who sets the earth a -tremble, broke it up on the rocks at your land's end. A wind from seaward served him, drove us there. We are survivors, these good men and I."

Answers

Answer:

"Now, by the gods, I drove my big hand spike deep in the embers, charring it again, and cheered my men along with the battle talk to keep their courage up: no quitting now."

hope this helps

plz mark brainliest

Choose a passage from the novel a tree grows in brooklyn by betty smith and examine how the language in the passage evokes a sense of time and place.

Answers

"She was always glad when the Fourth of July came, for that was the only time the street was clean. All the children helped; even the littlest ones, who could only carry the pails of water, were given a job."

This passage from the novel A tree grows in Brooklyn by Betty Smith evokes a sense of time and place by describing the Fourth of July as a time when the street is clean. This suggests that the street is usually dirty, which would be typical of a city in the early 1900s. The passage also describes the children helping to clean the street, which would be a common sight in a poor neighborhood where everyone had to pitch in to help.

Learn more about Fourth of July at : https://brainly.com/question/28442833

#SPJ4

b. Arrange the following words as per the order in dictionary chanting, chopper, chiruping, chivalry, chancellor​

Answers

1. chancellor 2. chanting 3. chiruping 4. 5 chooler

Answer:

chancellor​

chanting

chiruping

chivalry

chopper

Explanation:

When sorting words like this, you go by alphebetical order- if the letters are the same, you move to the next letter. All of them have CH, so you can ignore that part, but for example- Chancellor goes before Chanting because while they both begin with CHAN, C is before T in the alphabet.

Study the following statements. What is your opinion on these matters?

1. Poverty is generally caused by unemployment.
2. Traffic in Metro Manila does not improve.
3. Malnourishment should be given enough attention.
4. Climate Change is not real.
5. Earthquakes are caused by climate change.

Answers

Answer:

1.Poverty can be caused by a variety of factors, including unemployment, but it is not always the sole cause. Other factors such as lack of access to education and healthcare, discrimination, and systemic inequality can also contribute to poverty.

2.Traffic in Metro Manila is a complex issue that is affected by a variety of factors, such as population growth, urbanization, and a lack of infrastructure and public transportation options. While traffic may not improve, there are steps that can be taken to mitigate its effects, such as implementing traffic management policies and investing in public transportation.

3.Malnutrition is a significant public health concern that can have long-term consequences for individuals, families, and communities. It is caused by a lack of access to nutritious food and other factors such as poverty, lack of education, and poor sanitation. It should be given enough attention by governments and other organizations to address it.

4.Climate change is a real and pressing issue that is caused by human activities such as the burning of fossil fuels and deforestation. It can lead to changes in weather patterns, rising sea levels, and other severe consequences for the planet and its inhabitants.

5.Earthquakes are caused by the movement and shifting of tectonic plates in the Earth's crust and are not caused by climate change. However, Climate change can exacerbate the effects of natural disasters such as earthquakes by increasing the severity of landslides, and flooding which can occur after an earthquake.

Explanation:

Which of the following nations was an Asian ally of Nazi Germany?
(A) the United States government.
(B) the Aryans.
(C) the German government.
(D) the Nazi Party.

Answers

I could be wrong but I think it’s a trick question as the only Asian ally to the nazis (that I’m aware of) is the Japanese

you find an excellent quote in a literary journal to support your argument paper on symbols in the work of d.h. lawrence. the quotation you want to cite seems to be too long so you

Answers

If the quotation you want to cite in your argument paper on symbols in the work of D.H. Lawrence seems too long, you can use ellipses to indicate that some words have been omitted from the original text.

This will allow you to include the relevant parts of the quotation while still maintaining the clarity and flow of your paper. To use ellipses, you can indicate the omission of words by using three spaced dots (...). If the omitted text includes a period, you should include four spaced dots (....) to indicate the end of the sentence. Be sure to use ellipses accurately and ethically to avoid misrepresenting the author's original intent.

In addition to using ellipses, you may also want to consider summarizing or paraphrasing the quotation to condense it further while still conveying the main idea. This can help you integrate the quotation more smoothly into your paper and avoid excessive block quotations that disrupt the flow of your writing.

To learn more about quotation, visit here

https://brainly.com/question/1228787

#SPJ4

you find an excellent quote in a literary journal to support your argument paper on symbols in the work of d.h. lawrence. the quotation you want to cite seems to be too long. write quotation

What does figurative language require that literal language does not?
O A. Imagination
O B. Illustration
O C. Definitions
O D. Connotation

Answers

Answer:

figurative language has imagination and literal don't

To ensure that your speech flows smoothly from one thought to another among and within the coordinate points of your outline, use ____________.

Answers

To ensure that your speech flows smoothly from one thought to another among and within the coordinate points of your outline, use transition statements.

Transition statements are words or phrases that link your ideas together and help your audience follow your train of thought. They can be used to introduce a new point, summarize a previous point, or show the relationship between two points.

Some common transition statements include:

First, second, third, etc.In addition, furthermore, moreover, etc.On the other hand, however, yet, etc.In conclusion, to sum up, in short, etc.

Transition statements can be used to make your speech more logical and easier to understand.

Learn More about Speech:

https://brainly.com/question/30462177

#SPJ11

In “He—y, Come On Ou—t!,” what is remarkable about the hole that the villagers discover?

Answers

Knowing that the nuclear waste was safely contained below gave the city residents relief. Without thinking about the implications, city inhabitants may generate more and more.

How does "He—y, Come On Ou—t! Which of the latter two incidents involving the employee best exemplifies situational irony?

The narrator overhears the worker saying something he truly doesn't intend. The reader is better informed about what is going on than the worker is.

How does Hey come on out use the hole?

The concessionaire who bought the pit utilized it to let the town to dump all of its rubbish. For it, he was paid.

To know more about villagers discover visit:

https://brainly.com/question/17066665

#SPJ1

Read the excerpt from act 3, scene 1, of julius caesar. [caesar.] so in the world: 'tis furnished well with men, and men are flesh and blood, and apprehensive; yet in the number i do know but one that unassailable holds on his rank, unshaked of motion; and that i am he let me a little show it even in this— that i was constant cimber should be banished, and constant do remain to keep him so. what is the best summary of this monologue? caesar says that he will eventually release cimber from exile because "men are flesh and blood, and apprehensive," and he thinks that all men deserve forgiveness. caesar explains that we are all flesh and blood and also apprehensive. he does not know any man who cannot be moved by reason, except possibly one. caesar refuses to reverse cimber’s banishment. he says that, although the world is full of reasonable men, he is the only one who stands firm, and he will stick by his sentence to prove it. caesar explains that the world is full of men who are flesh and blood. they are capable of letting reason change their minds, and occasionally he is one of them who does change his mind. because cimber made a good argument, he will reverse his decision.

Answers

Julius Caesar was a tragedy by a play writer, William Shakespeare. In act 3, Caesar refuses to change the banishment as he wants to stand firm on his decision.

What is a summary?

Summarization is an abstract or brief account of the text information of the essays or the poems. It explains the long text in a few sentences with the correct meaning.

In act 3 of scene 1, Caesar orders not to change the banishment of Publius Cimber although he is a reasonable man, Caesar wants to stand firm on this decision.

Therefore, option C. Caesar refuses to lift the banishment of Cimber and stands firm on his decision.

Learn more about Julius Caesar here:

https://brainly.com/question/11710888

Answer:

option C. Caesar refuses to lift the banishment of Cimber and stands firm on his decision.

Explanation:

What are the 5 parts of an Argument Essay?

Answers

Answer:

Explanation:

Intro

Supporting claim

supporting claim

counter claim

conclusion

Introduction, 1st body, 2nd body, counter argument, conclusion

reread these sentences from paragraph 5. what is the tone of the underlined sentences

Answers

Answer:

What?...

Explanation:

There is no paragraph.

an example of a folk custom used to diffuse information about agriculture is:_____.

Answers

Answer:

Vietnamese songssongs

Explanation:

Other Questions
What is one way that people can harm the environment? By planting new trees and plants. By putting garbage in lakes By recycling and reusing objects. By driving their car less and biking more. "Income payments" are a part of the Current Account Balance. Which option is correct about income payments?For Canada, income payments refer to money that Canadian financial investors received on their foreign investments.For Canada, income payments refer to money that Canadian citizens who are working outside of Canada receive and transfer to Canada.For Canada, income payments refer to money that foreign investors who had invested their funds in Canada receive and transfer to their country.For Canada, income payments refer to money that foreign workers who are working inside Canada receive and transfer to their country. True or false? The difference between the state of matter (solid, liquid & gas) is their energy & bond Scatter plots are used to visualize association in samples of paired data (x, y). group starts a. true b. false Find the prime factorization of 56. 1 A football kicked at ground level with an initial velocity of 64 fret per second.standard fox - 641IV. GraphI.vertex form: --10-27 - 14intercept formy - 4)a. To find the maximum height of the football.Form: ChooseExplana1 II III IVb. To find the begle afer scoadsForm: (C)EmplaceI II III IV.. To find the time when the ball hits the groundForm (case)ExplI II III IVd. To find an estimate of the time when the football is 40 feetchForm Goose ExplI II III IV In which set of ordered pairs, (x, y), is y not a function of x?O {(6,2), (2,6)}O {(6,2), (1,2) }O {(1,6), (6,1), (6,2) }O {(1,1), (6,6), (2,2) } A gas, initially at 2.50 atm and 3.00 L, expands to a volume of 10.00 L. What is the new pressure of the gas? Anya has a piece of fabric that is 14 yards long. She is going to divide it into smaller pieces in a ratio of 3 to 4 in order to make a skirt and a top. What will be the length of the shorter piece of fabric? For anyone who has a bunny/a pet who has had ear mites:My bunny got it this morning and I was wondering what in the world could have caused it? Also, I already have medicine I just want to know what caused it... thanks! Write the ratio as a fraction in simplest form.63 : 28The ratio as a fraction in simplest form is . Determine the sum of the factors of 100 Determine the wavelength of the light absorbed when an electron in a hydrogen atom makes a transition from an orbital in which n=2n=2 to an orbital in which n=7n=7. If there is a perfect mountain valley of the world,eg. Of init is certainly the magnificence valley of Kashmir. (a) It is surrounded by a snow-capped, lofty (b) mountains which make it a land for springs (c)and beautiful lakes. For the past hundred (d)of years the beauty of Kashmir have held the (e)visitors spellbound Srinagar, the chief cities (f)of the valley or the summer capital of (g)Jammu and Kashmir lying on the banks of the Jhelum. direct materials used $ 191,200 direct labor incurred (7,700 hours) 245,800 actual manufacturing overhead incurred 276,600 estimated manufacturing overhead 384,000 estimated direct labor hours 8,000 the company uses direct labor hours as the allocation base. how much overhead was applied during the year? multiple choice $384,000 $276,600 $369,600 $245,800 In the given figure, the area of ADE is 16 units. What is the area of ABC? pls me with this maths assignment help asap!! find the center of:9x^2+y^2-18x-6y+9=0show work pls!! The OS that has a Dock is theLinuxMacWindowsMS DOS the explicit rule for an arithmetic sequence is f(n) 13 6(n 1). find the first four terms of the sequence.