With an exponent you can express it as a .....

Original Exponent: $\displaystyle 7(5)^\frac{1}{2}$

$\displaystyle =17.5$

Express it as a fraction: $\displaystyle \frac{7}{5^\frac{-1}{2}}}$

$\displaystyle =17.5$

Express it as a root: $\displaystyle 7\sqrt{5}$

plugging the above into a calculator yields $\displaystyle 15.65$. Did I do something incorrect, shouldn't it equal $\displaystyle 17.5$ like the other examples? Am I doing something incorrectly? Thanks