The number 9 is revered in Hinduism and considered a complete, perfected and divine number because it represents the end of a cycle in the decimal system, which originated from the Indian subcontinent as early as 3000 BC. Nine is a significant number in Norse Mythology.

The most commonly used system of numerals is decimal. Indian mathematicians are credited with developing the integer version, the Hindu–Arabic numeral system. Aryabhata of Kusumapura developed the place-value notation in the 5th century and a century later Brahmagupta introduced the symbol for zero.

The Egyptians invented the first ciphered numeral system, and the Greeks followed by mapping their counting numbers onto Ionian and Doric alphabets. The key to the effectiveness of the system was the symbol for zero, which was developed by ancient Indian mathematicians around 500 AD.

The idea of number and the process of counting goes back far beyond history began to be recorded. There is some archeological evidence that suggests that humans were counting as far back as 50,000 years ago. However, we do not really know how this process started or developed over time.

Nature gave us ten fingers, and so it is natural for us to count in tens. Machines count bigger numbers in the same way we do: by counting how many times they run out of digits. This system is called binary and the binary number 10 means the machine ran out of digits one time. A human would call this number two.

Homo habilis

Top Five Extinctions

• Ordovician-silurian Extinction: 440 million years ago.
• Devonian Extinction: 365 million years ago.
• Permian-triassic Extinction: 250 million years ago.
• Triassic-jurassic Extinction: 210 million years ago.
• Cretaceous-tertiary Extinction: 65 Million Years Ago.

1.5 billion people

Beginning around 5 billion years from now, the Sun will expand, becoming a swollen star called a red giant. By 7.5 billion years in the future, its surface will be past where Earth’s orbit is now. So the expanding Sun will engulf, and destroy, the Earth. It’s been suggested that Earth might escape.

In 5.4 billion years from now, the sun will enter what is known as the red giant phase of its evolution. This will cause the core to heat up and get denser, causing the sun to grow in size. It is calculated that the expanding sun will grow large enough to encompass the orbit’s of Mercury, Venus, and maybe even Earth.

In about 5.5 billion years the Sun will run out of hydrogen and begin expanding as it burns helium. It will swap from being a yellow giant to a red giant, expanding beyond the orbit of Mars and vaporizing Earth—including the atoms that make-up you.

about 4.5 billion years

13.77 billion years

In about 5 billion years, the Sun will start to run out of hydrogen in its core to fuse, and it will begin to collapse.

For about a billion years, the sun will burn as a red giant. Then, the hydrogen in that outer core will deplete, leaving an abundance of helium. Astronomers estimate that the sun has about 7 billion to 8 billion years left before it sputters out and dies.

Answer: The now-used Hindu Arabic numerals originated from India. The Arabians spread it from trade to other parts of the world.

√2 is irrational. Now we know that these irrational numbers do exist, and we even have one example: √2. It turns out that most other roots are also irrational. The constants π and e are also irrational.

Irrational Numbers Similarly, the square root of two (√2) can be estimated as 1.4, but 1.4 * 1.4 does not equal 2 exactly. There is no fraction equaling any decimal which, multiplied by itself, equals two.

List of Perfect Squares

As we have calculated further down on this page, the square root of 11 is not a whole number. 11 is not a perfect square. Is the square root of 11 rational or irrational? The square root of 11 is a rational number if 11 is a perfect square.

As , the square root of zero is simply zero.

Yes, the square root of zero is zero. (This is beyond high-school-level math, but it’s possible to extend the real numbers by adding an extra number which squares to zero but isn’t zero itself—this gives rise to the dual numbers, which have some interesting properties.)

1 Answer. A perfect square is the square of an integer – or nonnegative integer, without loss of generality, since (−x)2=x2. Since 0=02, 0 is a perfect square.

Yes, the square root of 0 is a real number.

The square root of 10 is an irrational number with never-ending digits.

Every positive real number has two square roots, one positive and one negative. For this reason, we use the radical sign to denote the principal (nonnegative) square root and a negative sign in front of the radical – to denote the negative square root.