Question

Calculate $\left(\frac{9}{7}\right)^{2} \left(\frac{2}{7}\right)^{-2}$.

Answer 1

$\left(\frac{9}{7}\right)^{2} \left(\frac{2}{7}\right)^{-2}$

=

$(\frac{81}{49} )( \frac{49}{4} )$

=

$( \frac{81}{1} )( \frac{1}{4} )$

=

$\frac{81}{4}$