I need help for this one lol

Find the nonpermissible replacement for binthis expression.b2/5b +5

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%

Awindow washer cleans 42 windows in 2 hours. at this rate, how many windows did he clean in 180 minutes.