The expression
$\displaystyle {\left({\frac{{{x}^{{3}}{y}}}{{{y}^{{3}}}}}\right)}^{{\frac{{2}}{{7}}}}$

equals $\displaystyle \frac{{x}^{{r}}}{{y}^{{t}}}$ where
r, the exponent of x, is: Preview Question 6 Part 1 of 2  
t, the exponent of y, is: Preview Question 6 Part 2 of 2