If a number is added to itself, it is twice that number → 18 ÷ 2 = 9 → 9 + 9 = 18
-9.
Answer: 11It's a list of prime numbersQ:.....since when is 9 a prime number?Answer: 17It's not a list of primes, it's not a Fibonacci sequence. The only pattern I see is that the last number in the sequence gets a number added to it to produce the next number in the sequence, the number that's added doubles each time. E.g. 2+1 = 3 (1 is added)3+2 = 5 (1 is doubled = 2, then added)5+4 = 9 (2 is doubled = 4, then added)9+8 = 17 (4 is doubled = 8, then added)
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9
If a number is added to itself, it is twice that number → 18 ÷ 2 = 9 → 9 + 9 = 18
18+x=27 calculate and your answer should be 9.
Any number, real or imaginary, can be the sum of another number plus 9.
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-9.
Answer: 11It's a list of prime numbersQ:.....since when is 9 a prime number?Answer: 17It's not a list of primes, it's not a Fibonacci sequence. The only pattern I see is that the last number in the sequence gets a number added to it to produce the next number in the sequence, the number that's added doubles each time. E.g. 2+1 = 3 (1 is added)3+2 = 5 (1 is doubled = 2, then added)5+4 = 9 (2 is doubled = 4, then added)9+8 = 17 (4 is doubled = 8, then added)
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9 ============================== Another contributor added more answers: Multiply 9 by any whole number. The answer is divisible by 3 and 9. There are an infinite number if them.
9
9 + x = 0 x = -9 Hence 9 - 9 = 0
It is number 9. If you add 3 three times it becomes 9 and if you multiply 3 by 3; it is 9.
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