# Who made the first phone?

## Who made the first phone?

Alexander Graham Bell

## Is the square root of 14 a real number?

The only square roots that are rational numbers are those who are perfect squares. √14 =3.74, which is not an integer and therefore is an irrational number.

IS 400 a perfect square?

400 is a perfect square. Because 20 * 20 = 400.

Is square root a real number?

The square roots of the perfect squares (e.g., 0, 1, 4, 9, 16) are integers. In all other cases, the square roots of positive integers are irrational numbers, and hence have non-repeating decimals in their decimal representations.

### What is the real number root?

All positive real numbers N have two square roots, written as – √N and + √N. If N is a positive real number, then n has two real values, with the same absolute value but with opposite signs. If N is a negative real number, then n has two imaginary values.

### What are the 2 square roots of 144?

See the Wikipedia article for more background. 144 has two roots, yes: ±12. So −12 is a root of 144.

What is a square root of 11?

121 3.317

When did most homes have phones?

By 1900 there were nearly 600,000 phones in Bell’s telephone system; that number shot up to 2.2 million phones by 1905, and 5.8 million by 1910. In 1915 the transcontinental telephone line began operating. By 1907, AT had a near monopoly on phone and telegraph service, thanks to its purchase of Western Union.

## IS 144 a perfect number?

Do you know that mathematically 144 is like a magic number. 144 is a perfect square. The sum of its digits is also a perfect square (9). The product of its digits is also a perfect square (16).

## Which is the square root of 144?

The value of the square root of 144 is equal to 12. In radical form, it is denoted as √144 = 12.

IS 144 a perfect square?

A perfect square is an integer whose square root is always an integer . For example, 9, 36, 144 etc are perfect squares. As we know,144 is a perfect square. Hence, the square root of 144 is 12.