How do I simplify 9rw^4/2r^3w^5 using only positive exponents

What is the value of m in the equation 1/2 m - 3/4n=16 when n=8

An internet company charges $8.95 per month for the first 3 months that it hosts your web site. then the company charges $11.95 per month for web hosting. how much money, in dollars, will the company charge for 8 months of web hosting?

Ineed to know the ordered pairs for this equation i need the answer quick because it’s a timed test