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What is the set of whole numbers closed by?
If you mean the set of non-negative integers ("whole numbers" is a bit ambiguous in this sense), it is closed under addition and multiplication. If you mean "integers", the set is closed under addition, subtraction, multiplication.
How many prime numbers are there from 100?
'from 100' ??? If you mean 'less than 100' then there are 25 primes. If you mean 'more than 100' then the answer is infinite, just like numbers are infinite.
What is the mean of all the whole numbers between -410 and 400 and how did you solve it?
The count of the numbers is 410+1+400 = 811. To get the sum of all these numbers note that all the positive numbers cancel with their negative counterparts and you are left only with the numbers from -410 to -401 (inclusive). The sum of these numbers is -4055. So their mean is Sum/Count = -4055/811 = -5.
What does the - sign mean before a number?
It means that the number is negative. Negative numbers are always under 0.
Geometric mean of 128 and 8?
For two numbers, the geometric mean is the sort of their product. Note I use * to mean multiply So here GM= sqrt (128*8) = sqrt (1024) =32
