1) Simplify. Write your answer using whole numbers and variables. (z-10)/(z^2)-10z square

To simplify the expression $\frac {z-10}{z^{2}-10z}$, we can factor the denominator.<br /><br />The denominator $z^{2}-10z$ can be factored as $z(z-10)$.<br /><br />So, the expression becomes $\frac {z-10}{z(z-10)}$.<br /><br />Now, we can cancel out the common factor $(z-10)$ in the numerator and denominator.<br /><br />Therefore, the simplified expression is $\frac {1}{z}$.