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like making a 3D building in your head?(only using your mind. No paper, pencil..)

I&S 1. do independent research and study on 2. the advantages of river systems, especially for civilizations 3. what advantages do rivers provide for a civilization or villages that love nearby rivers? 4. why are Geographic features like mountains, seas, rivers, etc. Important for civilizations? 5. make a comparison with geography between modern day the impact of geography on modern day society, choose any historic society and analyze the difference and similarities between the impact of geography on both society's modern and past. No specific word count for each question, write as much as partial possible and show good and deep research for each question. Bring what you find, such as pictures, citations, web websites that you visited etc, and bring it to class on the first day of school next year. It will be graded this way we will have discussion and a reflection of what they have learnt during the summer vacation.

Um... Hii! I am leo. Is there any guys who know sin and Cosin?

These should take about 30 minutes for people who are beginners to high school maths olympiads. Q1: Prove that (a^2/sqrt(b)+b^2/sqrt(c)+c^2/sqrt(a))*(1/a+1/b+1/c) is at least 9 when a, b, and c are all at least 1. Q2: Find the area of the orthic triangle of ABC given ABC's side lengths. Q3: If f(x) is a continuous one-to-one function, and for all x and y (f(f(x))+f(f(y)))/2=f((x+y)/2), find f(x)

whoever gets all of this right gets 5 axons! a train is delevering face masks from Ottawa to Washington DC.The train broke down at mid point.where is the train? what is the first thing you do in the morning which type of picture you will not reconize even if you knew everyone in the world? which type of tea is not a liquid? which type of dog is the tastiest?

the tiger holds a crew of 5.the commander,gunner,loader,driver and the radio operator.the armor was 25-120mm.the tank had used a v12 maybach hl230 p45 gasoline engine.the tank had a top speed of 38km per hour.the tiger had a deadly 88mm KWK 36 gun.the gun can penetrate m4 sherman armor the tiger had 2 mg 34 machine guns.one on the torrent and one in the hull.there were 6 smoke canisters on the sides of the torrent.they first saw combat at indonesia north africa.shocking the british forces.only 1350 tiger 1s were built between 1942-1944.

If √ x + y = 7 and x + √ y = 11 , what are the values of x and y

from:https://en.wikipedia.org/wiki/PiThis article is about the mathematical constant π pi is approximately equal to 3.1415926535897932384626433...The number π (/paɪ/) is a mathematical constant. It is defined as the ratio of a circle's circumference to its diameter, and it also has various equivalent definitions. It appears in many formulas in all areas of mathematics and physics. It is approximately equal to 3.14159. It has been represented by the Greek letter "π" since the mid-18th century, and is also spelled out as "pi". It is also called Archimedes' constant. Being an irrational number, π cannot be expressed as a common fraction, and equivalently its decimal representation never ends and never settles into a permanently repeating pattern. Still, fractions such as 22/7 and other rational numbers are commonly used to approximate π. The digits appear to be randomly distributed. In particular, the digit sequence of π is conjectured to satisfy a specific kind of statistical randomness, but to date, no proof of this has been discovered. Also, π is a transcendental number; that is, it is not the root of any polynomial having rational coefficients. This transcendence of π implies that it is impossible to solve the ancient challenge of squaring the circle with a compass and straightedge. Ancient civilizations required fairly accurate computed values to approximate π for practical reasons, including the Egyptians and Babylonians. Around 250 BC the Greek mathematician Archimedes created an algorithm for calculating it. In the 5th century AD Chinese mathematics approximated π to seven digits, while Indian mathematics made a five-digit approximation, both using geometrical techniques. The historically first exact formula for π, based on infinite series, was not available until a millennium later, when in the 14th century the Madhava–Leibniz series was discovered in Indian mathematics.[1][2] In the 20th and 21st centuries, mathematicians and computer scientists discovered new approaches that, when combined with increasing computational power, extended the decimal representation of π to many trillions of digits after the decimal point.[3][4] Practically all scientific applications require no more than a few hundred digits of π, and many substantially fewer, so the primary motivation for these computations is the quest to find more efficient algorithms for calculating lengthy numeric series, as well as the desire to break records.[5][6] The extensive calculations involved have also been used to test supercomputers and high-precision multiplication algorithms. Because its most elementary definition relates to the circle, π is found in many formulae in trigonometry and geometry, especially those concerning circles, ellipses, and spheres. In more modern mathematical analysis, the number is instead defined using the spectral properties of the real number system, as an eigenvalue or a period, without any reference to geometry. It appears therefore in areas of mathematics and the sciences having little to do with the geometry of circles, such as number theory and statistics, as well as in almost all areas of physics. The ubiquity of π makes it one of the most widely known mathematical constants both inside and outside the scientific community. Several books devoted to π have been published, and record-setting calculations of the digits of π often result in news headlines. Attempts to memorize the value of π with increasing precision have led to records of over 70,000 digits.

1.There is a plane that crashes on the border of Florida and Georgia . Where would you bury the survivors? 2. A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why? 3. I shave every day, but my beard stays the same. What am I? 4.I have branches, but no fruit, trunk or leaves. What am I? 5.What gets bigger when more is taken away? 6. I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I? 7.What invention lets you look right through a wall? 8.If you’re running in a race and you pass the person in second place, what place are you in? 9. It belongs to you, but other people use it more than you do. What is it? 10.What has one head, one foot and four legs? 11.What can you catch, but not throw? 12.What kind of band never plays music? 13.What has many teeth, but can’t bite? 14.What has a head and a tail but no body?

Riddle: What has to be broken before you can use it? Riddle=There’s a one-story house in which everything is yellow. Yellow walls, yellow doors, yellow furniture. What color are the stairs? Riddle. What can you break, even if you never pick it up or touch it Riddle: A man dies of old age on his 25 birthday. How is this possible? You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first? Riddle: What can’t talk but will reply when spoken to?

https://www.youtube.com/watch?v=uqwC41RDPyg Enjoy!!

1. 1955 — Montgomery Bus Boycott This boycott was born after Rosa Parks was arrested for refusing to give up her seat on a bus in Montgomery, Ala., to a white male passenger. The next day, Dec. 1, 1955, the Rev. Martin Luther King Jr. proposed a citywide boycott against racial segregation on the public transportation system. African Americans stopped using the system and would walk or get rides instead. The boycott continued for 381 days and was very effective. In June 1956, a federal court ruled that the laws in place to keep buses segregated were unconstitutional, and the U.S. Supreme Court eventually agreed. The Montgomery bus boycott was one of the first major movements that initiated social change during the civil rights movement. 2. 1961 — Albany Movement This movement protested the segregation policies in Albany, Ga. Many groups took part in the Albany movement, including the Student Nonviolent Coordinating Committee (SNCC), the National Association for the Advancement of Colored People (NAACP), local activists and King's Southern Christian Leadership Conference (SCLC). King’s goal was to offer counsel rather than become a participant, but he was jailed during a demonstration and was given a sentence of 45 days or a fine. He chose jail to push for change but was released three days later. Some concessions were made to the coalition, but the movement eventually disbanded after nearly a year of protests without accomplishing its goals. 3. 1963 — Birmingham Campaign The goal of the Birmingham campaign was to end discriminatory economic policies in the Alabama city against African American residents. They faced deep financial disparities and violent reprisal when addressing racial issues. The campaign included a boycott of certain businesses that hired only white people or maintained segregated restrooms. Protesters used nonviolent tactics such as marches and sit-ins with the goal of getting arrested so that the city jail would become crowded. Police used dogs and high-pressure water hoses against protesters. This campaign came to a successful end when many signs of segregation at Birmingham businesses came down and public places became accessible to people of all races. 4. 1963 — March on Washington This was the largest political rally for human rights ever in the United States. An estimated 200,000 to 300,000 participants converged on the Mall in Washington, D.C., on Aug. 28, 1963, to protest for jobs and freedom for African Americans. King delivered his iconic “I Have a Dream” speech on the steps of the Lincoln Memorial. The March on Washington is credited with helping pass the Civil Rights Act of 1964. 5. 1965 — Bloody Sunday This march went down in history as Bloody Sunday for the violent beatings state troopers inflicted on protesters as they attempted to march peacefully from Selma, Ala., to the state capital, Montgomery. The march was aimed at fighting the lack of voting rights for African Americans. Approximately 600 protesters were to travel from Selma on U.S. Highway 80 to the state capital on March 7, 1965, led by John Lewis, then chairman of the Student Nonviolent Coordinating Committee, and the Rev. Hosea Williams of the Southern Christian Leadership Conference. Police violence against protesters brought the march to a shocking end. Footage of the brutality broadcast across the nation sparked public outrage and boosted support for the civil rights movement. 6. 1965 — Chicago Freedom Movement The Chicago Open Housing Movement, also called the Chicago Freedom Movement, was formed to protest segregated housing, educational deficiencies, and employment and health disparities based on racism. The movement included multiple rallies, marches and boycotts to address the variety of issues facing black Chicago residents. By Jan. 7, 1966, King announced plans to get involved in the Chicago Freedom Movement, and on Aug. 5, 1966, King led a march near Marquette Park in a white neighborhood. The marchers were met with rocks, bottles and firecrackers. Approximately 30 people were injured, including King, who was hit in the head with a brick. After negotiations with Chicago Mayor Richard Daley, an agreement was announced on Aug. 26, 1966, to build public housing in predominately white areas and to make mortgages available regardless of race or neighborhood. The Chicago Freedom Movement continued through 1967 and was credited with inspiring the Fair Housing Act, passed by Congress in 1969. 7. 1967 — Vietnam War Opposition Many groups and individuals vehemently opposed the Vietnam War in the massive peace movement of the 1960s and '70s. King compared the antiwar movement to the civil rights movement and denounced U.S. involvement in a series of speeches, rallies and demonstrations. His first public speech against the war, called “Beyond Vietnam,” was delivered in April 1967 in front of 3,000 people at Riverside Church in New York. He called for a stop to all bombing in North and South Vietnam, as well as a declaration of a unilateral truce and a move toward peace talks. His stance cost him many allies, including President Lyndon Johnson, but King maintained his antiwar position until his assassination exactly one year to the day after he delivered his “Beyond Vietnam” speech. 8. 1968 — Poor People’s Campaign The goal of the Poor People’s Campaign was to gain more economic and human rights for poor Americans from all backgrounds. A multicultural movement, the campaign included Asian Americans, Mexican Americans, Puerto Ricans, Native Americans and whites along with African Americans. A march on Washington was planned for April 22, 1968, but when King was assassinated on April 4, the movement was shaken and the march postponed. By May 12, approximately 50,000 demonstrators had converged on the Mall in Washington and erected a tent city, called Resurrection City, in what became a live-in. The campaign's major march occurred at the Solidarity Day Rally for Jobs, Peace and Freedom on June 19. The occupation lasted six weeks and ended when bulldozers arrived and mowed down Resurrection City on June 24. The bill of rights the campaign strived to establish never became law, but the federal government enacted several programs to end hunger.

https://www.youtube.com/watch?v=nbbK1EnxABQ

“ Coronaviruses (CoV) are a large family of viruses that cause illness ranging from the common cold to more severe diseases such as Middle East Respiratory Syndrome (MERS-CoV) and Severe Acute Respiratory Syndrome (SARS-CoV). Coronavirus disease (COVID-19) is a new strain that was discovered in 2019 and has not been previously identified in humans. Coronaviruses are zoonotic, meaning they are transmitted between animals and people. Detailed investigations found that SARS-CoV was transmitted from civet cats to humans and MERS-CoV from dromedary camels to humans. Several known coronaviruses are circulating in animals that have not yet infected humans. Common signs of infection include respiratory symptoms, fever, cough, shortness of breath and breathing difficulties. In more severe cases, infection can cause pneumonia, severe acute respiratory syndrome, kidney failure and even death. Standard recommendations to prevent infection spread include regular hand washing, covering mouth and nose when coughing and sneezing, thoroughly cooking meat and eggs. Avoid close contact with anyone showing symptoms of respiratory illness such as coughing and sneezing.” -World Health Organization

1.) When I am a human, I save lives, but when I turn into my animal form, I will kill. What am I? 2.)I speak without a mouth and hear without ears. I have no body, but I come alive with wind. What am I? 3.)I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I? 4.)What is seen in the middle of March and April that can’t be seen at the beginning or end of either month?“Not so fast!” Jaya says. “Now I know

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