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20 January, 21:23

Evaluate: 7 z + (-z), when z = 4.

+4
Answers (2)
  1. 20 January, 23:01
    0
    Plug 4 into the expression for the value z and complete the expression,

    7 (4) + (-4) = 28-4

    24.
  2. 21 January, 00:54
    0
    First insert 4 into the place of every z. Making the problem 7 (4) - 4. Next multiply 7 and 4 to get 28, then simply subtract 4. Your answer will be 24
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