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1)For what numbers is the rational expression undefined? (If there are less than two answers, enter NONE in any extra boxes.) x/x^2-2x-24

x=_____ Smaller value

x=_____ Larger Value

2)Simplify the complex fraction. 3m-6/5m/4m-8/25

I got the answer 3/500m and I still got it wrong

3)Perform the operation. Write the answer without negative exponents. Assume that all variables represent positive real numbers. (If the simplification is an imaginary number, enter IMAGINARY.) (-27/8n^6)^-2/3