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Mathematics (09) Practice Test11. Which of the following sets of numbers is closed undersubtraction?A. the whole numbersB. the real numbersC. the irrational numbersD. the imaginary numbers12. A number is considered rational if it can be:A. located on a number line.B. found by solving an algebraic equation.C. expressed as the quotient of an integer and a non-zerointeger.D. represented by a construction with a compass and astraightedge.13. If the least common multiple of two integers is equal to theirproduct, then which of the following statements must be true?A. They have no prime factors in common.B. They have some but not all prime factors in common.C. They contain exactly the same set of prime factors raisedto different powers.D. They contain exactly the same set of prime factors raisedto the same powers.11