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math

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Please show steps and give me explanations! Thank you.

1. If x=1/2, what is the value of

1/x+1/x-1 ?

The answer is 0.

2. The sequence ZWYX may be changed in either two ways. Either two adjacent letters may be interchanged or the entire sequence may be reversed. What is the LEASt number of such changes needed to put the letters into alphabetical order from left to right?

The answer is 3.

  • math (Partial) -

    1. Dividing by 1/2 is the same as multiplying by 2. How does that change your answer?

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