Cphill here another one once I get the first part written out I get stuck help please or anyone can help.

(r¼s ²⁄5)²º=

———————

       r²

OK , using the rule of exponents that says (a^m) ⁿ =  a ^m*n  the numerator becomes

(r⁵ * s⁸ )     and we have

(r⁵ * s⁸ ) / r²    which simplifies to

r³ * s⁸

Can I help too?

$$\\\dfrac{(r^{1/4}s^{2/5})^{20}}{r^2}\\\\
=\dfrac{(r^5s^8)}{r^2}\\\\
=r^3s^8$$