## College Algebra 7th Edition

a) $5-\sqrt 5$ b) $10-\pi$
a) $(\sqrt 5-5)$ is negative because $5\gt\sqrt 5$. Therefore, $|\sqrt 5-5|=-(\sqrt 5-5)=5-\sqrt 5$ b) Since $10\gt\pi$, the expression is already positive. Therefore, the answer is $10-\pi$.