Can someone help, i need help solving this problem

Calculate the missing value. round the answer to on decimal place. start with 70, increase it by 21%, and end up with

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

James wants to promote his band on the internet. site a offers website hosting for $4.95 per month with a $49.95 startup fee. site b offers website hosting for $9.95 per month with no startup fee. for how many months would james need to keep the website for site a to be a better choice than site b?