Rewrite the following expressions using just one rational exponent. Enter the numerator and denominator of the exponent. Cancel any common factors.
$\frac{u^{\frac{3}{2}}}{ u^{\frac{2}{7}}} = u^{\frac{a}{b}}$ where $a=$ and $b =$ .
$\frac{u^{\frac{3}{2}}}{ u^{\frac{1}{3}}} = u^{\frac{a}{b}}$ where $a=$ and $b =$ .
$\frac{ u^{\frac{1}{4}}}{ u^{\frac{1}{6}}} = u^{\frac{a}{b}}$ where $a=$ and $b =$ .
Hint: You divide powers with the same base by subtracting the exponents.