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Does a quadratic has a even number of roots?
Yes, but only if you count a root at the tangent as a double root.
What is the only number equals double its own square root?
4
What is a number written as the sum of values of digits called?
It is called the digital sum. If you keep doing it until you reach a single digit answer, it is called a digital root. The term digital root is sometimes also used for the digital sum. For example, 3042 gives the digital sum of 3+0+4+2 = 9 which is also its digital root. but 3047 gives the digital sum of 3+0+4+7 = 14 and the digital root is 1+4 = 5.
What 3 identical digit number divided by 9 has a remainder of 5?
There is none. Any number formed from 3 identical digits must have a digital root of 0, 3 or 6. These are, therefore, the only possible remainders when divided by 9. Note: The digital root of a number is the sum of all its digits. If the answer is greater than 9, repeat the process.
Is 3852 divisible by 6?
A trick to see if a number is divisible by 3, 6, or 9 is to use something called the digital root.First, add all the digits up:3+8+5+2 = 18We want a single digit, so add the digits in 18 (from the previous step) up:1+8 = 9The nine (a single digit) is called the digital root.If a digital root of a number is equal to 3, 6, or 9 than the number is divisible by 3.If a digital root of a number is equal to 3, 6, or 9 AND the number is even, than the number is divisible by 6.If a digital root of a number is equal to 9, than the number is divisible by 9.The digital root of 3852 is 9, and 3852 is even, so using the rules above the number is divisible by 3, 6, AND 9.
