Numbers

You write it as 74904917, exactly as in the question!

2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97

72

The set of prime numbers is infinite. There's a greatest one we know, but every year or so a new greater one is discovered.

9,614

To find the mean of numbers, add all of the numbers together and then divide them by the number of numbers there are.

For example if I want to find the mean of 1, 2, and 3. 1+2+3= 6 and there are 3 numbers that I am using to find the mean (1, 2, and 3). So I divide 6 by 3 and get 2 which is the mean.

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2

By saying them aloud. 1.47 is "one and forty-seven hundredths" or 1 and 47/100

61 67 71 73 79 83 89 97

Answer:

-2.2422422242222422224 is rational.

Rational numbers are numbers that can be expressed as the division of two integers, the divisor not being zero. -2.2422422242222422224 can be expressed as -22422422242222422224 divided by 10000000000000000000.


Answer:

If the number appears exactly as you wrote it in your question, then the number is rational as explained in the first answer.

However, I wonder if you might have left off the three dot "continuation symbol" and a "2". Irrational numbers cannot be properly expressed in decimal form (the decimal representation goes on forever without repeating), so sometimes we write the first few digits and put an ellipsis at the end to show they go on forever. Examples would be

pi = 3.14159...
e = 2.71828...

If you meant to write -2.24224222422224222224... then the number is (probably) meant to be irrational.

The prime numbers between 73 and 100 are:

73, 79, 83, 89, 97

No. All whole numbers ending in six are composite.

2 3 5 7 11 13 17 19 23 29

That's an infinite list. Here are the first 25: 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97

293 is already prime.

2 3 5 7 11 13 15

64

Use a factor tree.

18

9,2

3,3,2

9

If you mean by 'used' when were they first discussed then that was probably the Pythagoreans of Greece around the 5th century BC. They didn't use them so much as argue about them!

The first mathematician to use them systematically was Abu Kamil Shuja ibn Aslam of Egypt, around the 9th century. He used them as solutions and coefficients of equations.

For more information please see the wikipedia article about irrational numbers.

163 167 173 179 181 191 193 197 199

MCMXI is the number 1911 in roman numerals. This is a notation used earlier for representing numbers.

94,060