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19 July, 13:17

Maria solved the equation - 5 n = - 9. Her answer was n = 1. She is fairly confident about her answer, but wants to do a quick check of her solution using estimation.

Which of the following shows a good check of her answer?

-6 (2) = - 12

-5 (-2) = - 10

-5 (2) = - 9

-5 (2) = - 10

+5
Answers (2)
  1. 19 July, 16:40
    0
    -6 (2) = - 12

    -5 (-2) = - 10

    -5 (2) = - 9

    -5 (2) = - 10
  2. 19 July, 16:50
    0
    I think it's answer C. - 5 (2) = - 9
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