PLS HELP MEEE I WILL GIVE BRIANLIEST!!

How do i do this activity, is appreciated

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

Aaron invested a total of $4,100, some in an account earning 8% simple interest, and the rest in an account earning 5% simple interest. how much did he invest in each account if after one year he earned $211 in interest? select one: a. $200 at 8%, $3,900 at 5% b. $3,200 at 8%, $900 at 5% c. $900 at 8%, $3,200 at 5% d. $3,900 at 8%, $200 at 5%