The identity a² – b² = (a + b)(a – b) is true for all values of a and b. Compute the whole number value of 2021² – 2020²

Answers

Answer 1

Answer:

Explanation:

Remark

The numbers here when subtracted, make 1.

ie 2021 - 2020 = 1

So all you have is 2020+2021 = 4041

(2021 - 2020)(2021 + 2020) = 4041

This doesn't work for every number you could choose, but it works for these 2.


Related Questions

Calculate the concentration of the lactate ion in a solution that is 0.100 mm in lactic acid ( ch3ch(oh)coohch3ch(oh)cooh , pkapka = 3.86) and 0.080 mm in hclhcl .

Answers

Lactic acid ⇒ H+ + Lactate
pKa = 3.86

Ka = 1.38 x 10^-4 would be equal to [H+] [lactate] / [lactic acid]

HCl ⇒ H+ + Cl-
[H+] = 0.08

Lactic acid = 0.10 M

1.38 x10^-4 would be equal to 0.08 [Lactate] / 0.10

Lactate = 0.10(1.38 x 10^-4/ 0.08
Lactate = 1.73 x 10^-4

Even the most effective communicators may need to involve a third, unbiased party to help resolve an issue

Answers

The statement about most effective communicators involving a third unbiased party is; True.

What is effective communication?

Communication simply denotes the excahnge of messages between two or more persons.

Now, efficiency in communication doesn't denote that issues that would need an arbitrator wouldn't arise.

Being efficient in communication isn't a factor that will totally eradicate the fact that some differences or issues may arise between communicating parties.

Thus, we will conclude that an arbitrator may be needed to resolve issues between quarrelling parties

Read more about Effective Communication at; https://brainly.com/question/15384397

Find the probability that a person flipping a coin gets (a) the third head on the seventh flip; (b) the first head on the fourth flip.

Answers

The probability that a person flipping a coin gets:

(a) The third head on the seventh flip; is 0.117.

(b) The first head on the fourth flip is 0.0625.

What is the probability of flipping a coin?

If  one flip a coin there is always a chance that one can get a head or a tail and it is 50 percent.

Note that:

For the 3rd head to be on the 7th trial, then the other 2 heads will also be in the 6 trials;

Note also that the probability of having a head at any trial is= 1/2.

P(3rd head on 7th flip)=P(X=2 in 6 trials) . 1/2

([tex]n} \atop x}} \right.[/tex]) pˣ (1-p)ⁿ⁻ˣ. 1/2

=(⁶₂) (1/2)² (1/2)⁶⁻². 1/2

0.117

b. The probability of getting first head on the fourth flip.

That is, P (1st head on 4th flip)=P(X=0 in 3 trials) ⋅1/2

=([tex]3} \atop {0}} \right.[/tex])([tex]1/} \atop {2}} \right.[/tex])°([tex]1} \atop {/2}} \right.[/tex])₃³⁻°.(1/2)

=1/2⁴

=0.0625

Learn more about Flipping coins from

https://brainly.com/question/27031505

All but one of these factors is important in maintaining proper blood pressure and helping the blood circulate throughout the human body. That is

Answers

Answer:

turgor pressure

Explanation:

took quiz

Homeowners pay on the land they own. Workers pay on the money they earn in the workplace. Businesses are required to pay on their earnings

Answers

Answer:     Property Taxes

                   Income Taxes

                   Corporate Taxes

Explanation:

edge 2022

There are different types of taxes that are levied for each institution. Income corresponds to taxes paid by individuals on their earned money.

Why is it mandatory to pay taxes?

This compulsory charge is used in a government to finance public spending on social and administrative policies of the State. Failure to pay may result in legal penalties and fines.Tax simply means a compulsory levy that's paid by individuals and firms to the government. Every individual pays tax on their income and this is an income tax.

The payment of taxes is essential for the social and economic issues of a place, contributing to its development.Property, on the other hand, corresponds to taxes paid by property owners to state and local governments. Corporate taxes are the taxes that companies are required to pay on their earnings over the course of a year.

Therefore, There are different types of taxes that are levied for each institution. Income corresponds to taxes paid by individuals on their earned money.

Learn more about taxes on:

https://brainly.com/question/14807535

#SPJ5

Which word in the excerpt best shows mr. White’s reaction to meeting his wife’s demand? changed faltered wish trembling

Answers

The word in the excerpt best shows mr. White’s reaction to meeting his wife’s demand is; Trembling

Which word shows the excerpt?

This question is taking from a horror short story titled "The Monkey's Paw" authored by W. W. Jacob. The excerpt that best shows Mr. White’s reaction to meeting his wife’s demand in that story is the word "Trembling".

Mr. White's reaction was of grief by lamenting his son's death as well as his decision to wish on the monkey's paw in the first place. Secondly,  Mr. White realizes he should have never invited trouble by wishing for the two hundred pounds or to bring Herbert back to life.

Thus, the right word in the excerpt that shows Mr. white's reaction is "Trembling.

Read more about best excerpt at; https://brainly.com/question/18637068

Which of the substances have a standard heat of formation ( δH∘f ) of zero?

Answers

All elements in their standard states (oxygen gas, solid carbon in the form of graphite, etc.) have a standard enthalpy of formation of zero, as there is no change involved in their formation.

A simple circuit within a laptop has a single resistor with a resistance of 0.1 ω and requires a current of 50 ma. select the voltage that would allow the computer to function correctly.

Answers

Answer:

5 mV

Explanation:

True or false all of the radiation from the sun is absorbed by the earth

Answers

Answer:

True !!

Explanation:

Hope this helps !!

This is true because the sun produces heat and the earth absorbs it. And if you go out side while it’s sunny and touch the ground and it’s hot, that’s called radiation.

Which element exhibits both metallic and nonmetallic properties?

Answers

Answer:

metalloids exhibits both metallic and nonmetallic properties

Large shrubs and trees are often planted near rivers to help prevent flooding. The deep, highly-absorbent roots of these shrubs and trees help soak up heavy rains before they begin to flood the land. Because they reach high above the ground and their branches and leaves spread outward, trees can also reduce the amount of rainfall that reaches the ground by up to 45%. In the event of a flood, what additional benefit might these shrubs and trees provide?

Answers

Answer:

i think its c

Explanation:

An operating system (os) is a set of programs that all the _________ activities among computer or mobile device hardware

Answers

Answer:

manages all the activities of software and hardware

A manager at a pizza shop wants to start visually checking finished pizzas, but she doesn't have time to check every pizza. she decides to check a random pizza in the first 20 made each day, and then check every 20th, start superscript, start text, t, h, end text, end superscript pizza thereafter.

Answers

The type of sample that was used by this manager is: systematic sampling.

What is sampling?

Sampling can be defined as a process that is used by researchers to collect or select data such as objects, observations, or individuals from a larger statistical population, especially through the use of specific procedures.

The types of sampling.

In Statistics, there are different types of sampling used by researchers and these include the following;

Stratified sampling.Random sampling.Convenience sampling.Cluster sampling.Systematic sampling.

A systematic sampling refers to a type of probability sampling method that involves a researcher collecting or selecting data from a larger population, especially by selecting an ordered (fixed) sample population at periodic interval such as the 20th pizza.

Read more on systematic sampling here: https://brainly.com/question/18957000

Ab2 is a molecule that reacts readily with water. Calculate the bond energy of the a–b bond using the standard enthalpy of reaction and the bond energy data provided. Enter a number in kj to 0 decimal places

Answers

By using the standard enthalpy of reaction, the bond energy of the (A-B) bond is equal to 152.25 kJ/mol.

The balanced chemical equation.

[tex]AB_2[/tex] is a molecule that reacts readily with water ([tex]H_2O[/tex]) as represented by this properly balanced chemical equation:

                              [tex]2AB_2 +2H_2O \rightarrow O_2 +4HB+A_2\; \Delta H = -142\;kJ[/tex]

Bond:                              O–H       O=O           H–B       [tex]A \rightarrow A^+[/tex]

Bond energy (kJ/mol):   467         498             450         321      

The standard enthalpy of reaction.

Mathematically, the standard enthalpy of reaction can be calculated by using this formula:

[tex]\Delta H^{\circ}_R=\Delta H_{reactants}-\Delta H_{products}[/tex]

Substituting the given parameters into the formula, we have;

[tex]-142=[(2\times2(A-B)+(2\times2(O-H)-[(O=O)+4(H-B)+(A-A)]\\\\-142=4(A-B)+4(467)-498-4(450)-321\\\\-142=4(A-B)+1868-498-1800-321\\\\4(A-B)=-142-1868+498+1800+321\\\\4(A-B)=609\\\\(A-B)=\frac{609}{4}[/tex]

(A-B) = 152.25 kJ/mol.

Read more on bond energy here: brainly.com/question/5650115

When baking a cake you have a choice of the following pans

Answers

Answer:

Hi! Experienced baker here! I can't really tell what your options are, or the scenario, but if you're looking for the best cake pan, make sure they are non-stick. To prevent the sticking of cake, you can line the pan with parchment paper. Peel it off carefully after about 5 minutes after the cake is done.

In all, all cake pans sizes are great, but their quality is what matters.

Symbolic stress evokes the "fight or flight" response. True or false

Answers

Answer:

True

Explanation:

When you are stressed in an urgent situation, meaning you have symbolic stress, then you take either a fight or flight response, meaning you either fight the cause of your stress or run/flee from it.

An electromagnetic wave traveling through a vacuum has a wavelength of 1. 5 × 10–1 meter. The period of this electromagnetic wave is

Answers

Speed of EM wave in vacuum = 3 x 10⁸ meters per second.
Frequency = (speed) / (wavelength)
Period = 1/frequency

Period = (wavelength) / (speed) = (0.15) / (3 x 10⁸) = 0.5 nanosecond

( "nano..." = 10⁻⁹ )

The chemical colchicine disrupts cell division. which cell process would most likely stop if colchicine were added to a culture of human liver cells?

Answers

Answer:

C: Crossing over

Explanation: The answer is c because there crossing over the chemical colchcine over the human liver cells so there for it is c

The cell process that  would most likely stop if colchicine were added to a culture of human liver cells is the crossing over.

What is the crossing over?

Chromosomal crossover is also referred to as crossing over. It is defined as the exchange of inherited material between two homologous chromosomes' non-sister chromatids during physiological property reproduction, that is the result of the in recombinant chromosomes.

The crossing over is the cell process that would most likely be stopped if colchicine was added to a culture of human liver cells.

Therefore, the crossing over chemical colchicine disrupts cell division.

To learn more about the crossing over, refer to:

https://brainly.com/question/27256451

#SPJ2

Are your knees the elbows of your legs or are your elbows the knees of your arms?

Answers

Yes, the knees are the elbows of the legs. Likewise, the elbows are the knees of your arms.

What are joints?

In the human anatomy, the arms and legs are frequently referred to as upper and lower limbs. The shoulders link the arms at the trunk, while the pelvic girdles connect the legs.

The knee and elbow are lower and upper limbs which are homologous joints to the legs and shoulders respectively. Each is extended by a sophisticated muscle mass operating through a single tendon.

Therefore, we can conclude that it is true that the knees are the elbows of the legs. Likewise, the elbows are the knees of your arms.

Learn more about joints here:

https://brainly.com/question/385948

Aaron has 3,250 followers on social media. His number of followers is increasing at a rate of 3% per week. Which function represents his number of followers each week?

Answers

The function that represents his number of followers each week is 3250 (1.03) w

See attached image for explanation.

Please consider marking brainliest.

As the period of a wave decreases, the wave's frequency

Answers

Answer:
Increase
Explanation:
The time period depicts the amount of time taken for completing one cycle of vibration. While frequency is the measurement of a number of cycles in a unit time.
Therefore, both the period of wave and frequency are inversely proportional to each other. The higher will be the time period, the lower will be the frequency and vice versa.

What is the best inference about nora’s character, based on this passage? nora understands business and has capabilities beyond her duties as a homemaker. Nora does not understand financial matters and is not able to save as much money as she would like. Nora cares more for her children and her husband’s comfort than she does for herself. Nora does not mind her doll-like existence and enjoys being pampered by her husband

Answers

Answer:

nora understands business and has capabilities beyond her duties as a homemaker.

Explanation: i took the assignment, trust me

Nora understands business and has capabilities beyond her duties as a homemaker. The correct option is 1.

What is business?

A business is a for-profit entity or organization that engages in professional activities.

They can be commercial, industrial, or any combination of the three. For-profit businesses exist to make a profit, whereas non-profit organizations exist to fulfill a charitable mission.

Business is the practice of earning a living or earning money by producing, purchasing, and selling goods. It is also "any profit-making activity or enterprise."

Based on this passage, the best inference about Nora's character is that she understands business and has abilities beyond her responsibilities as a housewife.

Thus, the correct option is 1.

For more details regarding business, visit:

https://brainly.com/question/15826771

#SPJ7

Your question seems incomplete, the probable complete question is:

Nora: I may tell you that there is something that is called, in business, quarterly interest, and another thing called payment in installments, and it is always so dreadfully difficult to manage them. I have had to save a little here and there, where I could, you understand. I have not been able to put aside much from my housekeeping money, for Torvald must have a good table. I couldn't let my children be shabbily dressed; I have felt obliged to use up all he gave me for them, the sweet little darlings!

–A Doll’s House,

Henrik Ibsen

What is the best inference about Nora’s character, based on this passage?

Nora understands business and has capabilities beyond her duties as a homemaker.Nora does not understand financial matters and is not able to save as much money as she would like.Nora cares more for her children and her husband’s comfort than she does for herself.Nora does not mind her doll-like existence and enjoys being pampered by her husband.

Which statement should fill in the blank in the last line of the proof? ∠m is supplementary to ∠o ∠n is supplementary to ∠p ∠m ≅ ∠p ∠n ≅ ∠p

Answers

The statement that fills in the blank in the last line of proof is : ∠n ≅ ∠p

Parallelogram

Given that the figure described in the question is a parallelogram the angles in the figure are supplementary angles. Supplementary angles that add up to 180° but not less than 90°  and angles ∠n ≤ 180° and ∠p≤180°

Hence we can conclude that the correct option that fills in the blank in the last line of proof is  ∠n ≅ ∠p

Learn more about parallelogram : https://brainly.com/question/3050890

Attached below is the missing part of the question

A partial proof was constructed given that MNOP is a parallelogram. Parallelogram M N O P is shown. By the definition of a parallelogram, MN ∥ PO and MP ∥ NO. Using MP as a transversal, ∠M and ∠P are same-side interior angles, so they are supplementary. Using NO as a transversal, ∠N and ∠O are same-side interior angles, so they are supplementary. Using OP as a transversal, ∠O and ∠P are same-side interior angles, so they are supplementary. Therefore, __________________ because they are supplements of the same angle

They planned to make a chicken vegetable salad brainly

Answers

Assuming you want to make a chicken vegetable salad whose main ingredients are lettuce, cabbage, pineapple, carrots, potatoes, chicken and quail, there are 168 ways to put four ingredients at a time.

7 x 4 = 28 x 3 = 84 x 2= 168What is a simple combination?

It corresponds to a grouping of combinatorial analysis, where n is the number of elements of k, which are subsets formed with k elements.

Therefore,  when using 7 ingredients to combine using every 4 ingredients, there are 168 possible ways to make this combination.

Find out more about combinatorial analysis here:

https://brainly.com/question/13524888

In a random sample of cell​ phones, the mean full retail price was ​$ and the standard deviation was ​$. assume the population is normally distributed and use the​ t-distribution to find the margin of error and construct a ​% confidence interval for the population mean . interpret the results.

Answers

Using the​ t-distribution the margin of error  is 128.04 and 95% confidence interval for the population mean is:315.46; 571.54.

Confidence Interval

Using the margin of error for a confidence interval formula

Margin of error(m) = t × (s/√n)

Where:

t=critical value for a 2 tailed test at a 5% level of significance

Degree of freedom  = 10 - 1 = 9

Level of significance α = 5%

Value of t using t distribution table= 2.262

Hence:

Margin of error = 2.262 × (179/√10)

Margin of error = 128.04

95% confidence level for the population mean (u):

Confidence level =Mean ± Margin of error

Confidence level = 443.5 ± 128.04

Confidence level=(443.5 - 128.04); (443.5 + 128.04)

Confidence level= (315.46; 571.54)

Inconclusion the margin of error  is 128.04 and 95% confidence interval for the population mean is:315.46; 571.54.

Learn more about Confidence Interval here:https://brainly.com/question/14955659

Does the author succeed in persuading you to accept his argument

Answers

The context clues are important to know if the author succeed in persuading one to accept the argument.

What are context clues?

Your information is incomplete as you didn't provide the argument. Therefore, an overview will be given.

Context clues are the hints that are given in a literary work. They're important to understand the story.

In this case, it's important to.read and understand the story. Also, look out for the theme. This is important to know if the author succeeded.

Learn more about context clues on:

https://brainly.com/question/1330487

Which of these are good ways to find a buyer’s agent? select all that apply

Answers

The ways to find a buyer's agent include all of the following:

ReferralsSearch onlineInterview agents

Who is a Buyer's Agent?

A buyer's agent can be described as a real estate professional that guides a buyer when making a purchase of a home.

The duty of a buyer's agent is to ensure the buyer gets the best deal and also protest the buyer's interest.

Thus, getting referrals from people who have used trusted buyer's agent is a good way to find a good buyer's agent. Also, you can search online and/or interview agents to get the best one.

Therefore, the ways to find a buyer's agent include all of the following:

ReferralsSearch onlineInterview agents

Learn more about buyer's agent on:

https://brainly.com/question/26181665

The length of a certain wire is kept the same while its radius is doubled. is the new resistance larger or smaller? compare the new resistance to the old one.

Answers

Answer:

B. It is reduced by a factor of 4.

Explanation:

I hope this helps

Have an AMAZING day. :)

How does lucillius, a minor character in the play, help advance the plot in this passage? lucillius is protective of cassius so he diminishes the seriousness of the conflict. Lucillius tells brutus that cassius intends to attack brutus, increasing the tension and conflict. Lucillius does not tell brutus much about cassius, which causes brutus to question the loyalty of lucillius. Lucillius explains that cassius is far less frlendly than he once was, and brutus uses the information to confirm his judgement that cassius is turning against him

Answers

The way that Lucillius, a minor character in the play, helps advance the plot is because: D; Lucillius gives Brutus information about Cassius, which influences Brutus’s judgment of Cassius.

What is the meaning of the plot?

Lucillius and Cassius were the character of the given play whose author was William Shakespeare.

Now, Brutus and Cassius were involved in the death of Caesar, the Roman Emperor and when Lucillius tried  to speak with Cassius, he said that he was treated civilly but not affectionately.

Thus, the correct option is that Lucillius gives Brutus information about Cassius because it influences Brutus’s judgment of Cassius.

Read more about play plot at; https://brainly.com/question/13675636

Answer:

D. Lucillius explains that Cassius is far less frlendly than he once was, and Brutus uses the  information to confirm his judgement that Cassius is turning against him.

How do the words pageantry, awake, and tingling relate to the painting? they emphasize the painting’s small depiction of icarus drowning. They describe the vibrant landscape depicted in the painting. They suggest that the farmer and shepherd are unware of icarus. They reinforce the idea that icarus’s wings melted in the sun

Answers

The words pageantry, awake, and tingling relate to the painting by

describing the vibrant landscape depicted in the painting.

The painting "Landscape with the fall of Icarus" by Pieter Brueguel

The painting is also associated with the poem of the same name, written by William Carlos Williams. The painting describes Williams poem with strong and attractive colors.

These words; pageantry, awake, and tingling were used to describe the vibrant landscape portrayed in the painting.

Therefore, the correct answer is option B

Learn more about painting:

https://brainly.com/question/1119113

Answer:

B. They describe the vibrant landscape depicted in the painting.Explanation:

Other Questions
If Michael's dirt bike has a full 2-gallon tank. and runs through 1.5liters every 30 minutes of constant riding. how much gas will he have left after 2 hours and 45 mins? Which of the following numbers is a factor of 55?Choose 1 answer:Choose 1 answer:(Choice A)A6(Choice B)B3(Choice C)C5(Choice D)D7 how does The Cold War relate to Kennedys Speech Space Race The function of enzymes is to -Astore oxygen in muscle.Bchange the rate of reaction.form the cell membrane.Dbe building blocks for cells Amy and Stephanie were playing a number game. Amy picked a number and told Stephanie that if she added 9 to the number and multiplied the sum by 2, it would equal 8. Which equation could Stephanie use to find the number, x? Assume that Jackson is a price-taker and the current wholesale market price is $7.30 per can of paint. What is the target total of cost in producing and selling 6 million cans of paint? Given Jackson's current total costs, will the company reach stockholders' profit goals? Begin by calculating Jackson's target total cost. Select the formula labels and enter the amounts. (Enter currency amounts in dollars, not in millions. Round all currency amounts to the nearest whole dollar.) Revenue at market price $43,800,000 Less: Desired profit 6000000 Target total cost 31,800,000 if the midpoint is located at (6,-2) and one endpoint is at (1,7), what is the coordinates of the other endpoint? What happens when a president does not return a bil in 10 days and what is the exception tothat rule? I need help pleaseI need help I need help Is cost and quality of product always the balance? Explain your answer On June 10, 1821, Moses Austin began his colony in Texas. Please select the best answer from the choices provided T F Which equations are true for x = -2 and x = 2? Select two optionsx2 - 4 = 0x2 = 43x2 + 12 = 04x2 = 16O2(x - 2)2 = 0 What events led to the british defeat at kings mountain? Which part of an atom has a positive charge?protonneutronelectronnucleus 2(x+9)-4=68 pls help me 60 points!!!! What is the sum of (3/8x-2) +(1/8x-5) 20=5x-13=6x what is x equaled toHELP ASAP Calculate the distance between (4,5) and (4,-10) Jerome hiked three-fourths of a mile in two-thirds of an hour. What was his hiking speed in miles per hour? help, please !!!!!!!!