book Maths Puzzle Numerical Ability

Four married couples enter a restaurant. How many ways can they be seated at a round table so that the men and women alternate and no husband and wife sit next to each other. (As

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Hi, my name is virna and im really not sure where this question is catogorize under, but here's my question: What is the Additive inverse of a number and also, what is the absolute Can you tell me how to find the domain and range of this quadratic function?

y = -2x^2 - x + 4

Thanks!