Use the definition of rational exponents to write the following with the appropriate root. Then simplify. 
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Q9: Use the definition of rational exponents to
Q10: Simplify the expression. Remember, negative exponents give
Q11: Use the properties of exponents to simplify
Q12: Use the definition of rational exponents to
Q13: Find the following root, if possible.
Q15: The time t in seconds it takes
Q16: Simplify the expression. Remember, negative exponents give
Q17: Simplify the expression. Assume all variables represent
Q18: Simplify the expression. Assume all variables represent
Q19: Use the properties of exponents to simplify
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