exam Maths Puzzle Numerical Ability

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Need to make long and short range missiles. Can't make more than 50 missiles and no more than 30 long range types. Spend 60,000 on short range and 90,000 on long

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With compound inequalities, you have two or more inequalities joined by the "and" or "or". Which of the following compound inequalities are true?
A) x>4 and can you tell me if this problem is correct (3-2i)-(6+5i)

(3-2i)-(6+5i)=3-6-2i-5i=-3-7(-1)=-3+7=4