Plz help serious answers only

The table respent two linear functions the equation respented by the first tables is given

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

Dakota earned $7.50 in interest in account a and $18.75 in interest in account b after 15 months. if the simple interest rate is 4% for account a and 5% for account b, which account has the greater principal? explain. to make it a little easier, there is an image. good luck!