1. Simplify the expression $2b^{-5} + \frac{11}{b^5}$. Write your answer using only positive exponents. ___
2. Simplify the expression $\frac{8m}{n^3} - \frac{15m}{n^3}$.
3. Simplify $10z^{-2} - \frac{6}{z^2}$. Write the result using only positive exponents. ___
4. Which expression is equivalent to $8pq^{-3} + \frac{3p}{q^3}$?
5. Which expression is equivalent to $5k^{-4}$?
6. What is the excluded value for the rational expression $\frac{a-4}{a+10}$? The excluded value is $a = \_\_\_$.
7. Which value of $y$ must be excluded from the domain of the expression $\frac{y+1}{3y-15}$?
8. For a rational expression, an excluded value is a number that makes which part of the expression equal to zero?
9. Find the excluded value for the expression $\frac{z-7}{5z+30}$. The excluded value is $z = \_\_\_$.
10. What is the excluded value for the rational expression $\frac{x-6}{x+6}$?