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
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