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A number is prime if it has only 1 and itself as factors. For example, 7 is a prime number because it has only 1 and 7 as factors. 15 isn't a prime number because it has 1, 3,… 5, and 15 as factors. (MORE)

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In Numbers

No. Irrational numbers are numbers which cannot be expressed as a fraction p/q where p and q are integers. Because 15 can be expressed as 15/1, it is not irrational. It is act…ually a rational number and an integer. (MORE)

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yes it is the luckiest number in the world and nobody can deny it Well, I shall try to, where does this idea come from. Thinking a certain number is lucky is the short road t…o gambling addiction...luck is a fallacy...you make your own luck, do not rely on any number, its a fools game (MORE)

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No, 15 is not a prime number. It is a composite number. A prime number can only be divided by 1 and itself. The number 15 can also be divided by 3 and 5.

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To solve this you need to work out how big a number 1 percent of the number would be. So if 120 is 15 % then 1% = 120/15 = 8 Thus if 1 % of the number = 8, you need to mak…e this up to 100% by multiplying by 100. 8*100 = 800 So the number is 800. I hope you can follow this and that you will now be able to work with %. (MORE)

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In Numbers

The numbers are 8 to 22 (inclusive). It immediately springs to mind that if 15 is the average then the numbers will start at 15 - 7 (8) and finish at 15 + 7 (22), but let's pr…ove this! We know that 15 is the average of 15 numbers. We can therefore work out what the 15 consecutive numbers add up to. We can then use algebra to calculate these numbers. The numbers total 15 * 15 = 225 Therefore, where x is equal to the lowest number in the series: x + (x+1) + (x+2) + (x+3)...etc all the way up to + (x+14) = 225 Therefore: 15x + 105 = 225 15x = 225 - 105 15x = 120 x = 8. (MORE)

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In Science

No. Natural numbers include the set of *non-negative* integers. (An integer being the set of all numbers which have no decimal point. e.g. -1, 0, 1, 2, 3)

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In Uncategorized

the 5s because it has better service but it dosent have diffrent colrs just silver gold and black

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20c + 5 = 5c + 65 Divide through by 5: 4c + 1 = c + 13 Subtract c from both sides: 3c + 1 = 13 Subtract 1 from both sides: 3c = 12 Divide both sides by 3: c = 4

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In Numbers

Odd. All numbers ending in five are odd. In general, if a number isnot divisible by two, it is odd.