Question 22041
{{{(108r^2*y)/(9r^3*y^2)}}}
First of all you need to cancel out 108 and 9;
{{{(12r^2*y)/(r^3*y^2)}}}
Now you subtract the exponents of the same variables;
{{{12r^2r^-3*y^1r^-2}}}
{{{12r^-1*y^-1}}}
since they are negative exponents they go in the denominator;
{{{1/12ry}}}
Hope you understand, it's kinda hard to explain negative exponents
=)