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21 March, 03:35

7z-9z is equivalent to wich of the following

a. - 2

b. - 2z

c. - 2z2

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Answers (1)
  1. 21 March, 03:54
    0
    When subtracting terms like these, you need to subtract the coefficients.

    7-9=-2

    But don't forget that z which means the answer is B. - 2z
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