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What is the product of two negative and three positive numbers?
It is positive. Any product of an even number of negative numbers will be positive, regardless of how many positive numbers you have. Similarly any product of an odd number of negative numbers will be negative, regardless of how many positive numbers you have.
How many prime numbers are there between 600 and 700?
You can find lists of prime numbers online in many places. Just search Google for "list of prime numbers" or something similar.
How many pairs of even numbers can you find whose sum is forty six?
Infinitely many. However, if you don't want negative numbers, the lower of the two numbers must be at least 0, and at most 22. The higher of the two numbers, of course, will be 46 minus the first number. Perhaps you can work it out from there.
How many decimal places to the left do you move to change km2 to m2?
You move it negative 6 places to the left.
How many even numbers are less than 50?
If you include negative numbers, that's an infinite list.
