8n-30 - (5n+10) = 8n-30-5n-10 = 3n-40 more marbles than his brother
just subtract 5n+10 from 8n-30. 8n-5n=3n and 10--30 = 10+30 = 40
Genevieve T.
asked • 12/02/20Thomas has 8n - 30 marbles. His brother has 5n + 10 Marbles. Write an expression to find how many more marbles Thomas has than his brother
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