Question 1058865
You have 5 problems, but they're similar.
----
{{{(3r/s)/(4rs/s^2)}}}
For problems like this, you invert the divisor and multiply.
--> {{{(3r/s)*(s^2/4rs)}}}
= {{{3rs^2/4rs^2}}}
Cancel r and s^2
= 3/4
----------------
Do the others the same way.