Find the sum.
$(2 n - 9) - (- 2.4 n + 4)$

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Solution

$(2 n - 9) - (- 2.4 n + 4) = (2 n - 9) + (2.4 n - 4) {A d d t h e o p p o s i t e s} = 2 n + 2.4 n + (- 9) + (- 4) {C o m m u t a t i v e p r o p e r t y} = (2 n + 2.4 n) + [(- 9) + (- 4)] {G r o u p l i k e t e r m s} = (4.4 n) + (- 13) {C o m b i n e l i k e t e r m s]$
Final Answer: $4.4 n - 13$

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