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Find two rational expressions that have the difference of 2-n/n-4

Solve 3x-18=2y and 5x-6y=14 by elimination or substitution . show all !

Fred has a spinner that is split into four equal sections: red, blue, green, and yellow. fred spun the spinner 688 times. which of the following would be a good estimate of the number of times the spinner lands on the green section? a. 269 b. 603 c. 344 d. 189